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A sauna (// or //; Finnish pronunciation: [ˈsow-nɑ]) is a small room or house designed as a place to experience dry or wet heat sessions, or an establishment with one or more of these and auxiliary facilities.
A sauna session can be a social affair in which the participants disrobe and sit or recline in temperatures typically between 70 °C (158 °F) and 100 °C (212 °F). This induces relaxation and promotes sweating.
Saunas can be divided into two basic styles: conventional saunas that warm the air or infrared saunas that warm objects. Infrared saunas may use various materials in their heating area such as charcoal, active carbon fibers, and other materials.
The word sauna is an ancient Finnish word referring to the traditional Finnish bath and to the bathhouse itself. The proto-Finnic reconstruction is *savńa. There are etymological equivalents in the Finnic languages such as the Ingrian and Votic word sauna, Estonian saun, Võro sann and Livonian sōna. The word suovdnji in Sámi means a pit dug out of the snow, such as a hole for a willow grouse. In Baltic-Finnic languages other than Finnish, sauna does not necessarily mean a building or space built for bathing. It can also mean a small cabin or cottage, such as a cabin for a fisherman.
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First saunas 
The oldest known saunas were pits dug in a slope in the ground and primarily used as dwellings in winter. The sauna featured a fireplace where stones were heated to a high temperature. Water was thrown over the hot stones to produce steam and to give a sensation of increased heat. This would raise the apparent temperature so high that people could take off their clothes. The first Finnish saunas are what nowadays are called savusaunas, or smoke saunas. These differed from present-day saunas in that they were heated by heating a pile of rocks called kiuas by burning large amounts of wood about 6 to 8 hours, and then letting the smoke out before enjoying the löyly, or sauna heat. A properly heated "savusauna" gives heat up to 12 hours. These are still used in present-day Finland by some enthusiasts, but usually only on special occasions such as Christmas, New Year's, Easter, and juhannus (Midsummer).
As a result of the industrial revolution, the sauna evolved to use a metal woodstove, or kiuas [ˈkiu.ɑs], with a chimney. Air temperatures averaged around 70–80 degrees Celsius (160–180 degrees Fahrenheit) but sometimes exceeded 90 °C (200 °F) in a traditional Finnish sauna. Steam vapor, also called löyly [ˈløyly], was created by splashing water on the heated rocks.
The steam and high heat caused bathers to perspire. The Finns also used a vihta [ˈvihtɑ] (Western dialect, or vasta [ˈvɑstɑ] in Eastern dialect), which is a bundle of birch twigs with fresh leaves, to gently slap the skin and create further stimulation of the pores and cells.
The Finns also used the sauna as a place to cleanse the mind, rejuvenate and refresh the spirit, and prepare the dead for burial. The sauna was (and still is) an important part of daily life, and families bathed together in the home sauna. Because the sauna was often the cleanest structure and had water readily available, Finnish women also gave birth in the sauna.
Although the culture of sauna nowadays is more or less related to Finnish culture, it is important to note that the evolution of sauna has happened around the same time both in Finland and the Baltic countries sharing the same meaning and importance of sauna in daily life. The same sauna culture is shared in both places still to this day.
When the Finns migrated to other areas of the globe they brought their sauna designs and traditions with them, introducing other cultures to the enjoyment and health benefits of sauna. This led to further evolution of the sauna, including the electric sauna stove, which was introduced in 1938 by Metos Ltd in Vaasa  and far infrared saunas, which have become popular in the last several decades.
Modern saunas 
Under many circumstances, temperatures approaching and exceeding 100 °C (212 °F) would be completely intolerable. Saunas overcome this problem by controlling the humidity. The hottest Finnish saunas have relatively low humidity levels in which steam is generated by pouring water on the hot stones. This allows air temperatures that could boil water to be tolerated and even enjoyed for longer periods of time. Steam baths, such as the Turkish bath, where the humidity approaches 100%, will be set to a much lower temperature of around 40 °C (104 °F) to compensate. The "wet heat" would cause scalding if the temperature were set much higher.
In a typical Finnish sauna, the temperature of the air, the room and the benches is above the dew point even when water is thrown on the hot stones and vaporized. Thus, they remain dry. In contrast, the sauna bathers are at about 38 °C, which is below the dew point, so that water is condensed on the bathers' skin. This process releases heat and makes the steam feel hot.
Finer control over the temperature experienced can be achieved by choosing a higher level bench for those wishing a hotter experience or a lower level bench for a more moderate temperature. A good sauna has a relatively small temperature gradient between the various seating levels. Doors need to be kept closed and used quickly to maintain the temperature inside.
In Finland, the sauna was thought of as a healing refreshment. The old saying goes: "Jos ei viina, terva tai sauna auta, tauti on kuolemaksi." ("If vodka, tar, or the sauna won't help, the illness is fatal.") The Finnish sauna is not thought of as an easy way to get physical exercise, and it is not intended for weight loss; in fact, it predates these modern ideas.
Social and mixed gender nudity with adults and children of the same family is common in the conventional sauna. Sometimes the sauna is considered not only a sex-free, but also almost a gender-free zone. In the dry sauna and on chairs one sometimes sits on a towel for perceived hygiene and comfort, even though wood that hot is naturally hygienic; in the steam bath the towel is left outside. Some hotel sauna facilities and especially cruise ships and/or ferries have an area where refreshments (often alcoholic) are served in conjunction with the sauna/pool area; draping a towel around the waist is generally required in that part of such facilities. In case of temperatures of 90 °C or higher, towels or special wooden or plywood seats are used to sit on, as wooden bench feels too hot to sit comfortably directly on it.
As an additional facility a sauna may have one or more jacuzzis. In some spa centers there are the so-called special "snow rooms".
Finnish sauna 
Finnish sauna is traditionally the same as Russian banya despite the popular misconception that Finnish sauna is very dry. Records and other historical evidence indicate that the Finns built the first wooden saunas in the 5th or 8th century. Early saunas were dug into a hill or embankment. As tools and techniques advanced, they were later built above ground using wooden logs. Rocks were heated in a stone fireplace with a wood fire. The smoke from the fire filled the room as the air warmed.
Once the temperature reached desired levels, the smoke was allowed to clear and the bathers entered. The wood smoke aroma still lingered and was part of the cleansing ritual. This type of traditional smoke sauna was called a savusauna (black banya), which simply means "smoke sauna" in Finnish. Many[who?] people find the smell of smoke and wood relaxing.
In Finland swimsuits, towels, or any other garments are rarely worn in the sauna. Families often go to the sauna together, which is not considered eccentric since family saunas are an old tradition. In these private saunas swimsuits or towels are never worn. In public saunas it is more common that men and women go to the sauna separately, although people of both sexes may sometimes bathe together, for example in student clubs. Still, saunas are not associated with sex and sexuality. Quite the contrary, historically saunas have been the most sacred places after the church, and most houses which could afford to build a sauna had one. In older times women also used to give birth in the sauna because it was a warm and sterile environment. Children were occasionally born in saunas still in the beginning of the 20th century. Ancient Finns even believed saunas were inhabited by spirits.
The lighting in a sauna is dim, and some Finns prefer to sit in the sauna in silence, relaxing. The temperature is usually between 80 and 110 °C (176 and 230 °F). Sometimes people make a vasta (or vihta); they tie together small fresh birch branches (with leaves on) and swat themselves and their fellow sauna bathers with it. Vihtas can even be bought from a shop and stored into a freezer for later (winter) use. Using a vasta improves blood circulation, and its birch odour is considered pleasing.
A traditional Finnish sauna ends with a dip in a cool lake or 'avanto' (a hole made in the ice in wintertime) or with rolling in the snow. The idea is to cool off after the sauna (this must be done carefully, to minimize the risk of fainting). Cool-off time can end the sauna experience or it can be followed by another round or two. After showering, it is conventional to have a beverage, most commonly a beer or non-alcoholic drink, or traditionally a shot of Koskenkorva (vodka-like traditional Finnish spirit).
Estonian sauna 
Sauna traditions in Estonia are almost identical to Finland as saunas have traditionally held a central role in the life of an individual. Ancient Estonians believed saunas were inhabited by spirits. In folk tradition sauna was not only the place where one washed, but also used as the place where brides were ceremoniously washed, where women gave birth and the place the dying made their final bed. The folk tradition related to the Estonian sauna is mostly identical to that surrounding the Finnish sauna. On New Year's Eve a sauna would be held before midnight to cleanse the body and spirit for the upcoming year.
Today there are a wide variety of sauna options. Heat sources include wood, electricity, gas and other more unconventional methods such as solar power. There are wet saunas, dry saunas, smoke saunas, steam saunas, and those that work with infrared waves. There are two main types of stoves: continuous heating and heat storage-type. Continuously heating stoves have a small heat capacity and can be heated up on a fast on-demand basis, whereas a heat storage stove has a large heat (stone) capacity and can take much longer to heat.
Heat storage-type 
Smoke sauna 
Smoke sauna (Finnish savusauna, Estonian suitsusaun, Võro savvusann) is one of the earliest forms of the sauna. It is simply a room containing a pile of rocks, but without a chimney. A fire is lit directly under the rocks and after a while the fire is extinguished. The heat retained in the rocks, and the earlier fire, becomes the main source for heating the sauna. Following this process, the ashes and embers are removed from the hearth, the benches and floor are cleaned, and the room is allowed to air out and freshen for a period of time. The smoke deposits a layer of soot on every surface, so if the benches and back-rests can be removed while the fire is alight the amount of cleaning necessary is reduced. Depending on size of the stove and the airing time, the temperature may be low, about 60 °C, while the humidity is relatively high. The tradition almost died out, but was revived by enthusiasts in the 1980s.
Heat storage-sauna 
The smoke-sauna stove is also used with a sealed stone compartment and chimney (a heat storage-stove) which eliminates the smoke odour and eye irritation of the smoke sauna. A heat storage stove does not give up much heat in the sauna before bathing since the stone compartment has an insulated lid. When the sauna bath is started and the löyly shutter opened a soft warmth flow into the otherwise relatively cold (60 °C) sauna. This heat is soft and clean because, thanks to combustion, the stove stones glow red, even white-hot, and are freed of dust at the same time. When bathing the heat-storage sauna will become as hot as a continuous fire type-sauna (80–110 °C) but more humid. The stones are usually durable heat proof and heat-retaining peridotite. The upper part of the stove is often insulated with rock wool and firebricks. Heat-storing stoves are also found with electric heating, with similar service but no need to maintain a fire.
Continuous heat-type 
Continuous fire sauna 
A continuous fire stove, instead of stored heat, is a relatively recent invention. There is a firebox and a smokestack, and stones are placed in a compartment directly above the firebox. It takes shorter time to heat than the heat storage-sauna, about one hour. A fire-heated sauna requires manual labor in the form of maintaining the fire during bathing; the fire can also be seen as a hazard.
Fire-heated saunas are common in cottages, where the extra work of maintaining the fire is not a problem.
Electric stove sauna 
The most common modern sauna types are those with electric stoves. The stones are heated up and kept on temperature using electric heating elements. There is thermostat and a timer (eight hour maximum continuous heating time) on the stove. This type of heating is used in urban saunas.
Similar sweat bathing facilities 
The Finnish-style sauna (generally 70–80 °C (158–176 °F), but can vary from 60 to 120 °C (140–248 °F)) and the wet steam bath are the most widely known forms of sweat bathing.
Many cultures have close equivalents, such as the North American First Nations (in Canada) or Native American (in the United States) sweat lodge (Navajo: Inipi, Anishanabe: madoodiswan), the Karo oukup, the Turkish or Arab hammam, ancient Roman thermae, Nahuatl (Aztec) temāzcalli [temaːs'kalːi], Maya zumpul-ché, Mixtec Ñihi, Russian banya, Estonian saun, the Jewish Shvitz, African Sifutu, Swedish bastu, Japanese Mushi-Buro, and the Korean jjimjilbang. Public bathhouses that often contained a steam room were common in the 18th, 19th and early 20th centuries and were inexpensive places to go to wash when private facilities were not generally available.
Modern sauna culture around the world 
In Africa, on the whole, saunas are kept at a much lower temperature than in Europe.
In Iran, most gyms, hotels and almost all public swimming pools have indoor saunas. It is very common for swimming pools to have two saunas which are known in Persian as "سونای خشک" dry sauna & "سونای بخار" steam sauna, with the dry type customarily boasting a higher temperature. A cold water pool (and/or more recently a cold jacuzzi) is almost always accompanied and towels are usually provided. Adding therapeutic or relaxing essential oils to the rocks is far from uncommon. In Iran, unlike Finland, sitting in sauna is mostly seen as part of the spa/club culture, rather than a bathing ritual. It is most usually perceived as a means for relaxation or detoxification (through perspiration). Having a sauna room on a private property is considered a luxury rather than a necessity. Public saunas are segregated and nudity is prohibited.
In Japan, many saunas exist at sports centers and public bathhouses (sentō). The saunas are almost always gender separated, often required by law, and nudity is a required part of proper sauna etiquette. While right after World War II, public bathhouses were commonplace in Japan, the number of customers have dwindled as more people were able to afford houses and apartments equipped with their own private baths as the nation became wealthier. As a result many sentōs have added more features such as saunas in order to survive.
In Korea, saunas are essentially public bathhouses. Various names are used to describe them, such as the smaller mogyoktang, outdoor oncheon, and the elaborate jjimjilbang. The word 'sauna' is used a lot for its 'English appeal', however it does not strictly refer to the original Scandinavian steam rooms that have become popular throughout the world. The konglish word sauna (사우나) usually refers to bathhouses with Jacuzzis, hot tubs, showers, steam rooms, and related facilities.
Australia and Canada 
In Australia and Canada, saunas are found mainly in hotels, swimming pools, and health clubs and if used by both men and women, nudity is forbidden. In gyms or health clubs with separate male and female change rooms, nudity is permitted, however members are usually asked to shower before using the sauna and to sit on a towel.
Dutch-Speaking Europe 
The Netherlands and Flanders have a similar attitude to saunas as Germany, as almost all public saunas offer only mixed-gender nudity-compulsory facilities. A lot of these saunas do offer occasional women-only or bathing suit days or mornings for people who are less comfortable with mixed-gender nudity. Using a towel to completely cover the bench you're lying on is also compulsory, as is showering between a sauna and entering any of the pools (cold water pool, swimming pool or whirlpool) for hygienic purposes. Saunas are typically found on (day) resorts, featuring a dozen or more different types of saunas, steam pools, hot tubs, swimming pools and restaurants. Beauty treatments and different types massages can usually be booked as well.
In French-speaking Switzerland, customs are less rigid. Often, patrons have their choice of bathing nude or clothed. Other facilities offer nude single-sex saunas, nude mixed-gender saunas, and clothed mixed-gender saunas on the same premises.
France, the United Kingdom, and Mediterranean Europe 
In France, the United Kingdom, and much of southern Europe, single-gender saunas are the most common type. Nudity is expected in the segregated saunas but usually forbidden in the mixed saunas. This is a source of confusion when residents of these nations visit Germany and Austria or vice versa. Sauna sessions tend to be shorter and cold showers are shunned by most. In the United Kingdom, where public saunas are becoming increasingly fashionable, the practice of alternating between the sauna and the jacuzzi in short seatings (considered a faux pas in Northern Europe) has emerged. Foreign visitors should also be aware that some small establishments advertised as 'saunas' are in fact brothels and it is rare to have a legitimate sauna with no other health spa or gym facilities in the UK.
Saunas in northeastern Italian regions Friuli and Trentino-Alto Adige/Südtirol, as in Slovenia and Croatia, have setups similar to those in Germany and Austria, and are perhaps a bit more relaxed about enforcing rules: mixed-gender saunas and patrons have their choice of bathing nude or clothed.
In Portugal, the steam baths were commonly used by the Castrejos people, prior to the arrival of the Romans in the western part of the Iberian peninsula. The historian Estrabão spoke of Lusitans traditions that consisted of having steam baths sessions followed by cold water baths. Pedra Formosa its the original name given to the central piece of the steam bath in pre-Roman times.
German-Speaking Countries 
In Germany and Austria, where most public swimming pool complexes have sauna areas, nudity is the generally accepted rule, as is the covering of benches with towels. These rules are strictly enforced in some public saunas. Separate single-sex saunas for both genders are rare, most places offer women-only and mixed-gender saunas, or organise women-only days for the sauna once a week. Loud conversation is not usual as the sauna is seen as a place of healing rather than socialising. Contrary to Russia and Scandinavian countries, pouring water on hot stones to increase humidity (Aufguss, lit: "Onpouring") is not normally done by the sauna visitors themselves - larger sauna areas have a person in charge (the Saunameister) for that, either an employee of the sauna complex or a volunteer. Aufguss sessions can take up to 10 minutes, and take place according to a schedule. During an Aufguss session the Saunameister uses a large towel to circulate the hot air through the sauna, intensifying sweating and the perception of heat. Once the Aufguss session has started it is not considered good manners to enter the sauna, as opening the door would cause loss of heat (Sauna guests are expected to enter the sauna just in time before the Aufguss. Leaving the session is allowed, but grudgingly tolerated). Aufguss sessions are usually announced by a schedule on the sauna door. An Aufguss session in progress might be indicated by a light or sign hung above the sauna entrance. Cold showers or baths shortly after a sauna, as well as exposure to fresh air in a special balcony, garden or open-air room (Frischluftraum) are considered a must.
In German-speaking Switzerland, customs are generally the same as in Germany and Austria, although you tend to see more families (parents with their children) and young people. Also in respect to socialising in the sauna the Swiss tend more to be like the Scadinavians or Russians. Also in German-speaking countries, there are many facilities for washing after using the sauna, with 'dunking pools' (pools of very cold water in which a person dips themselves after using the sauna), showers. In some saunas and steam rooms, scented salts are given out which can be rubbed into the skin for extra aroma and cleaning effects.
Hungarians see the sauna a part of a wider spa culture. Here too, attitudes are liberal, mixed-gender people are together and they wear swimsuits. Single-sex saunas are rare, as well as those which tolerate nudity. Some Hungarian saunas have the so-called "snow rooms" that look like a little cages with snow and icicles, where visitors can cool down for a couple of minutes after the each sauna session.
The Nordics, the North Baltic States, Russia and Eastern Europe 
As the home of the sauna, Finnish sauna culture is well established, there are built-in-saunas in almost every house in Finland. Although cultures in all corners of the world have imported and adapted the sauna, many of the traditional customs have not survived the journey. Today, public perception of saunas, sauna "etiquette" and sauna customs vary hugely from country to country. In many countries sauna going is a recent fashion and attitudes towards saunas are changing, while in others traditions have survived over generations.
In Finland, Estonia, Latvia, Lithuania and Russia sauna-going plays a central social role. These countries boast the hottest saunas and the tradition of massaging fellow sauna-goers with leafy, wet birch bunches ('vasta' or 'vihta' in Finnish, 'viht' in Estonian, 'slota' in Latvian, 'vanta' in Lithuanian, 'веник' (venik) in Russian). The fast movements of the massage have created a common misconception that it is somewhat of a beating, however, the correct method of giving this kind of massage is to curb the hot air without actually touching the skin.
In Sweden and Norway saunas are found in many places, and are known as 'bastu' (from 'badstuga' = bath house). Public saunas are generally single-sex and it's often optional to use swimwear. When men and women use the sauna together swimwear is generally used.
In Russia, public saunas are strictly single-sex, while in Finland, Estonia, Lithuania and Latvia, both types occur. During wintertime, Finns often run outdoors for either ice swimming or, in the absence of lake, just to roll around in the snow naked and then go back inside. This is popular in Estonia, Latvia, Lithuania and Russia as well.
In ex-USSR there are three different types of saunas. The first one, previously very popular especially during the Soviet Era, is the public sauna or the banya, (also known as the Russian banya), as it is referred to among the locals is similar in context to public bath houses in Russia and in all ex-Soviet nations. The banya is a large setting with many different rooms. There is at least one dry sauna (Finnish style), one cold pool of water, a relaxion area, another sauna where fellow-sauna goers beat other fellow-sauna goers with the leafy birch, a shower area, a small cafeteria with a TV and drinks, and a large common area that leads to the other areas. In this large area, there are marble bed-like structures where people lie down and receive a massage either by another sauna-member or by a designated masseur. In the resting area, there are also other bed-like structures made of marbe or stone attached to the ground where people lie down to rest between different rounds of sauna or at the very end of their banya session. There is also a large public locker area where one keeps one's clothes as well as two other more private locker areas with individual doors that can lock these two separate locker rooms.
The second type of sauna is the normal Finnish dry sauna one can find in any gym throughout the world or a hotel. It could be in the locker room or mixed (i.e. male and female together). Attitudes towards nudity are very liberal and people are less self-conscious about their nude bodies.
The third type of sauna is one that is rented by a group of friends. It is similar to the public banya bath house type, except that it is usually more modern and luxurious, and is often rented by groups of friends by the hour for the use of partying and socializing. Here it can be single-sex or mixed-sex.
North America and Central America 
In Mexico and Central America, particularly in the highlands of central and southern Mexico and Guatemala, a version of the sauna indigenous to the Americas, called temazcal, is quite popular. It is the Mexican, Central American version of the sweatlodge used by indigenous people in the US and Canada, though the temazcal is usually made of clay or stone rather than wood. A characteristic of the temascal is that it can have religious connotations, as in the North American sweatlodge and represents the womb, the elements, and a microcosm of the earth, although in less traditional communities its main purpose is simply for washing oneself. Some unique characteristics of the temazcal is that it is often used by traditional midwives for helping childbirth, and traditional healers often treat their patients in the temazcal (mainly through herbalism, by putting various types of medicinal plants on the heat source for treating specific ailments).
Archeological sites in Greenland and Newfoundland have uncovered structures very similar to traditional Scandinavian farm saunas. Some with bathing platforms and "enormous quantities of badly scorched stones".
In the United States, the earliest saunas were Swedish bastus in the colony New Sweden around the Delaware River. The Swedish Governor at the time had a bathhouse on Tinicum Island. Today sauna culture enjoys its greatest popularity in the Lake Superior Region, specifically the Upper Peninsula of Michigan, especially the Keweenaw Peninsula, and parts of Minnesota, Wisconsin, and Iowa, which are home to large populations of Swedish and particularly Finnish Americans. Duluth, Minnesota, at its peak, had as many as 14 public saunas. Indeed, among Finnish farms in Great Lakes "sauna country", the cultural geographer Matti Kaups, found that 90% had sauna structures-more even than the farms in Finland. Elsewhere, sauna facilities are normally provided at health clubs and at hotels, but there is no tradition or ritual to their use, and many people fail to appreciate their benefits. To avoid liability, many saunas operate at only moderate temperatures and do not allow pouring water on the rocks. A wider range of sauna etiquette is usually acceptable in the United States compared to other countries, with the exception that most mixed-sex saunas usually require some clothing such as a bathing suit to be worn. These are uncommon, however, as most saunas are either small private rooms or in the changing rooms of health clubs or gyms. There are few restrictions and their use is casual; bathers may enter and exit the sauna as they please, be it nude, with a towel, dripping wet in swimsuits or even in workout clothes (the latter being very unusual). Like many aspects of US culture, there are few prescribed conventions and the bather should remain astute to "read" the specific family or community's expectations. Besides the Finnish Americans, the older generation of Korean-Americans still uses the saunas as it is available to them. Sauna societies are beginning to emerge in colleges across America, with the first one being formed at Gustavus Adolphus College.
The Sweat lodge, used by many native North Americans as a form of ritual cleansing, is a notable example of an indigenous tradition with many similarities to the Finnish Sauna, Russian Banya or Swedish Bastu. Often sage is used as a ritual aromatic in the ceremonies. Unlike many other sauna traditions, and most forcefully in the case of the Inipi, the sweat lodge ceremony has been robustly defended as an exclusively native expression of spirituality rather than a recreational activity.
In California, a variety of saunas can be found in urban centers, usually at spas or hot tub facilities. Usually these businesses rent medium or large sized rooms by the hour which contain a hot tub, an unenclosed shower, and/or a wet or dry sauna. Very often massage and other body and skin treatments are available at the same facilities, either by themselves or in the customer's private room. Businesses located in red-light districts often have prostitutes soliciting customers nearby.
In Massachusetts, Finnish immigrants established the Uljas Koitto ("Noble Endeavor") Temperance Society in 1892 to discourage the use of alcohol and illicit drugs and inform about Finnish Culture. In 1926, the society opened up a traditional Finnish sauna in Pembroke, MA.
The Korean-American communities in United States that have settled in urban cities such as Los Angeles county still use the sauna on a weekly basis. These businesses are common in the Koreatown district of Los Angeles. Saunas in Koreatown are built much like their predecessors in Korea, although on a smaller scale. Some saunas offer rooms that have special facilities, i.e. salt rooms, jade rooms, clay fomentation room, charcoal rooms, and various steam rooms.
In Washington, The Diplomatic Finnish Sauna Society of D.C. maintains a sauna on the grounds of the Finnish Embassy.
Traditions and old beliefs 
In Finland, Estonia and Latvia as well in Russia, the sauna is an ancient custom. It used to be a holy place, a place where women gave birth, and where the bodies of the dead were washed. There were also many beliefs and charms that were connected to sauna. It was, among other things, a place for worshipping the dead – it was thought of as such a wonderful place that even the dead would surely like to return to it. Curing diseases and casting love spells could also happen in the sauna. As in many other cultures, fire was seen as a gift from heaven in Finland, and the hearth and the sauna oven were its altars.
One word in Finnish, strictly connected to sauna, is löyly. It is difficult to translate precisely, but denotes the heat of the sauna room, especially the heat derived from throwing water on the hot stones of the sauna oven. (Löyly, pronounced [ˈløyly], can be understood as sauna steam). In many languages related to Finnish, a word corresponding to löyly is found. The same approximate meaning is used across the Finnic languages such as in Estonian leil. Originally this word meant "spirit" or "life", as in e.g. Hungarian lélek and Khanty lil, which both mean soul, pointing to the sauna's old, spiritual essence. There still exists an old Finnish saying, "saunassa ollaan kuin kirkossa," – one should be(have) in the sauna as in church.
The same meaning of "spirit" is also used in Latvian.
Saunatonttu, literally translated the sauna elf, is a little gnome or tutelary spirit that was believed to live in the sauna. He was always treated with respect, otherwise he might cause much trouble for people. It was customary to warm up the sauna just for the tonttu every now and then, or to leave some food outside for him. It is said that he warned the people if a fire was threatening the sauna, or punished people who behaved improperly in it – for example slept, or played games, argued, were generally noisy or behaved otherwise "immorally" there. Such creatures are believed to exist in different cultures. The Russian banya has an entirely corresponding character called a bannik.
In Thailand, women spend hours in a makeshift sauna tent during a month following child birth. The steam is typically infused with several herbs. It is believed that the sauna helps the new mother's body return to its normal condition more quickly.
A steam sauna can take 30 minutes to heat up when first started. Some users prefer taking a warm shower beforehand to speed up perspiration in the sauna. When in the sauna users often sit on a towel for hygiene and put a towel over the head if the face feels too hot but the body feels comfortable. In Russia, a felt "banya hat" may be worn to shield the head from the heat; this allows the wearer to increase the heat on the rest of the body.
Most adjustment of temperature in a sauna comes from,
- amount of water thrown on the heater, this increases humidity, so that sauna bathers perspire more copiously.
- length of stay in the sauna
- positioning when in the sauna
Heating caused by direct radiation will be greatest closest to the stove. Heating from the air will be lower on the lower benches as the heat rises. Provided the sauna is not crowded, lying on a bench is considered preferable as it gives more even temperature over the body. Heating caused by fresh steam can be very different in different parts of the sauna. As the steam rises directly upwards it will spread across the roof and travel out towards the corners, where it will then be forced downwards. Consequently, the heat of fresh steam may sometimes be felt most strongly in the furthest corners of the sauna. Users increase duration and the heat gradually over time as they adapt to sauna.
When pouring water onto the heater, it will cool down the heater, but carry more heat into the air via advection, making the sauna warmer.
Perspiration is a sign of autonomic responses trying to cool the body. Users are advised to leave the sauna if the heat becomes unbearable, or if they feel faint or ill. Some saunas have a thermostat to adjust temperature, but management and other users expect to be consulted before changes are made. The sauna heater and rocks are very hot - one must stay well clear to avoid injury, particularly when water is poured on the sauna rocks, which creates an immediate blast of steam. Combustibles on or near the heater have been known to result in fire. Wet floors can be slippery. Contact lenses dry out in the heat. Jewellery or anything metallic, including glasses, will get hot in the sauna and can cause discomfort or burning.
Temperature on different parts of the body can be adjusted by shielding from the steam radiator with a towel. Shielding the face with a towel has been found to reduce the perception of heat. It is advised, especially for women to put an additional towel or special cap on hair to avoid their dryness. Few people can sit directly in front of the heater without feeling too hot from radiant heat, but their overall body temperature may be insufficient. As the person’s body is often the coolest object in a sauna room, steam will condense into water on the skin; this can be confused with perspiration.
In an infrared dry sauna, the heaters produce infrared rays that superficially heat skin and other exposed surfaces but not the air. For safety reasons water is not placed on these types of heaters.
Cooling down is a part of the sauna cycle and is as important as the heating. Among users it is considered good practice to take a few moments after exiting a sauna before entering a cold plunge, and to enter a plunge pool by stepping into it gradually, rather than immediately immersing fully. Until used to having a full cold shower, warm ones are used and gradually make it colder so that the shock is not so great. After a shower, feeling cold or shivering indicates it is enough, the shiver is a sign of the autonomic responses, trying to warm the body. This is considered a signal for the sauna again. If however illness is felt later or during that day, a less hot sauna and warmer, longer cool down is tried the next day. In summer, any after effects like headache or nausea can come from insufficient cool down after the sauna, or from dehydration, failure to drink enough fluids. Sleep disturbances can also occur if not cooled down properly, even though not feeling hot, the heat in the core of the body may disrupt sleep as the body tries to cool at night. In summer, a session is often started with a cold shower.
Health risks and benefits 
Contraindications to sauna include unstable angina pectoris, a recent heart attack, and severe aortic stenosis. Sauna is safe, however, for most people with stable coronary heart disease. It is not harmful to the aged when used in moderation, is safe even for young infants over 3 months if limited to short (< 3 minutes) sessions, and does not affect wound healing. Sauna use may reduce the incidence of the common cold, and temporarily relieve the symptoms. It increases performance in endurance sport and increases heat tolerance threshold.
Saunas can be dangerous due to the risk of heat prostration or the even more serious hyperthermia. Children and older persons who have heart disease or seizure disorders or those who use alcohol or cocaine are especially vulnerable.
Prolonged stay in a sauna may lead to the loss of electrolytes from the body, the same as after rigorous exercise. Risks of dehydration leading to heat stroke in more sensitive individuals can occur and may be reduced by regular sipping of water or isotonic drinks, but not alcohol, during the sauna. Sauna bathing and heavy drinking of alcoholic beverages, and also sauna bathing during alcohol withdrawal (hangover) phase can undoubtedly create real health risks.
Sauna has been found to cause a rise in the stress hormones adrenocorticotropic hormone (ACTH), cortisol, adrenaline, and noradrenaline due to hyperthermic stress on the body. Cortisol remains high even after 30 minutes of rest. Sauna also found to reduce prostaglandin F2alpha and protect against oxidative stress. It enhances activation of monocytes to bacteria and endotoxins.
Aggregate (uncorrected) risk of death can estimated to be 10−7 per visit in Finland. In essentially all cases, the victim had diabetes, a heart condition or other serious chronic disease. More than 50% were men over the age of 50, and 30% were over 70; furthermore, most often the victims were intoxicated.
Sauna plus multidisciplinary treatment may reduce chronic pain more effectively than multidisciplinary treatment alone. Sauna reduces chronic pain more effectively than cognitive behaviour therapy. It is indicated for rheumatic pain (with cold shower) but not for neuropathic pain. Is effective for appetite loss and mild depression. Indicated in reducing symptoms in chronic fatigue syndrome, and rheumatoid arthritis, and indicated for anorexia nervosa. Sauna has been proposed for treatment of other conditions glaucoma, Sjogren syndrome, chronic fatigue syndrome, fibromyalgia, anorexia nervosa, obstructive lung disease, recuperation after childbirth, and also for lifestyle related diseases of, diabetes, arteriosclerosis, obesity, hypertension, hyperlipidemia, atherosclerosis and smoking induced symptoms.
In some countries the local gymnasium is usually the closest and most convenient and some pool, major sport, or even resort complexes also contain a sauna. Therapeutic Sauna is often carried out in conjunction with physiotherapy or hydrotherapy, gentle exercises within the capability of the person without exacerbating symptoms.
With cold exposure 
In addition a sauna followed by a cold shower has been shown to reduce pain in rheumatoid arthritis where pain is mediated by sensitised c-fibre sympathetics. Regular saunas have also been found to improve micro circulation and reduce vasoconstriction and hypertension. Many symptoms of chronic illnesses may be due to vasoconstriction effects (e.g. cold sensitivity, physical pain, and even mood states); and sauna improves microcirculation and blood supply to constricted areas.
Research has also shown that adaptation to cold through short term cold stimulus, as in cold swimming, immersion (or showers) has the added benefit of improving the body's anti oxidant capabilities, with increases in glutathione and reduction of uric acid, which may mean better handling of the stresses of illness. Those that are shown to involve reduced glutathione or increased glutathione use, include; cardiovascular conditions, pulmonary diseases, diabetes, inflammatory bowel diseases, cancer, osteoporosis, aging, and after pesticide exposure. Conditions involving oxidative stress include neuro degenerative diseases, CFS, bone fracture and others. Conditions in which increased uric acid may be a risk factor include, gout, metabolic disease and vascular diseases.
A reported study from the Thrombosis Institute in London into the effects of the cold bathing found that volunteers that followed a disciplined daily regime had increased immune white blood cells and the level of the body's natural blood thinning enzymes substantially increased, improving micro circulation. It also stimulated the production of hormones such as testosterone in men, and boosted women's production of estrogen. Cold water immersion raises thresholds of pain tolerance, and aids adaptation to cold, reduces muscle spasm, can influence the frequency of respiratory infections and improve subjective well-being. It may cause an immunological modulation in terms of the Th1-type pattern, which is a proinflammatory cytokine profile. It is involved in diseases such as arthritis, diabetes, inflammatory myopathies, inflammatory bowel disease, psoriasis, CFS, fibromyalgia, chronic pain, fatigue conditions, auto-immune disease and other inflammatory conditions. Cold water adaptation reduced total cholesterol and LDL cholesterol, lowered plasma viscosity and blood pressure rate product. Cold water immersion reduces recovery time in athletes, enhances repeat performance and reduces exercise induced muscle damage.
Cold water exposure challenges both the neuro-endocrine and the immune systems, reduces stress hormones and attenuates their response. Increases ADH and cortisol and increases immunomodulatory cytokines. Cold water exposure and adaptation can modify the sensory functions of hypothalamic thermoregulatory centres to lower heat loss and produce less heat during cold exposure and have immunostimulating effects. The thermogenic action of adrenaline in cold exposure produces heat and may reduce this stress hormone. An important effect is the ability of sauna to use up excess sympathetic nerve tone in both the central and peripheral nervous systems and just as importantly use up excess levels of local tissue hormones involved in feedback loops to the hypothalamus, thus aiding recovery in chronic illness.
See also 
- Body treatment
- Contrast shower
- Finnish sauna
- Hot spring
- Hot tub
- Mud bath
- Public bathing
- Purification Rundown
- Steam room
- Steam shower
- Sweat therapy
- Taiwanese hot springs
- Thermal bath
- Turkish bath
- World Sauna Championships
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