Hot flashes (also known as hot flushes) are a symptom which may have several other causes, but which is often caused by the changing hormone levels that are characteristic of menopause. They are typically experienced as a feeling of intense heat with sweating and rapid heartbeat, and may typically last from two to thirty minutes for each occurrence.
- 1 Causes and mechanism
- 2 Presentation
- 3 Types of hot flashes
- 4 In younger women
- 5 Treatment
- 6 In men
- 7 Regional variance
- 8 See also
- 9 References
- 10 External links
Causes and mechanism
Research on hot flashes is mostly focused on treatment options. The exact etiology and pathogenesis, or causes of vasomotor symptoms (VMS)—the clinical name for hot flashes—has not yet been fully studied. There is empirical knowledge that hints at reduced levels of estrogen as the primary cause of hot flashes. There are indications that hot flashes may be due to a change in the hypothalamus's control of temperature regulation. This would mean that the sensation of heat is not merely imaginary, but due to actual changes in body core temperature.
Hot flashes, a common symptom of menopause and perimenopause, are typically experienced as a feeling of intense heat with sweating and rapid heartbeat, and may typically last from two to thirty minutes for each occurrence. The sensation of heat usually begins in the face or chest, although it may appear elsewhere such as the back of the neck, and it can spread throughout the whole body. Some women feel as if they are going to faint. In addition to being an internal sensation, the surface of the skin, especially on the face, becomes hot to the touch. This is the origin of the alternative term "hot flush", since the sensation of heat is often accompanied by visible reddening of the face. Excessive flushing can lead to rosacea.
The hot-flash event may be repeated a few times each week or every few minutes throughout the day. Hot flashes may begin to appear several years before menopause starts and last for years afterwards. Some women undergoing menopause never have hot flashes. Others have mild or infrequent flashes. The worst sufferers experience dozens of hot flashes each day. In addition, hot flashes are often more frequent and more intense during hot weather or in an overheated room, the surrounding heat apparently making the hot flashes themselves both more probable and more severe.
Severe hot flashes can make it difficult to get a full night's sleep (often characterized as insomnia), which in turn can affect mood, impair concentration, and cause other physical problems. When hot flashes occur at night, they are called "night sweats". As estrogen is typically lowest at night, some women get night sweats without having any hot flashes during the daytime.
Types of hot flashes
Some menopausal women may experience both standard hot flashes and a second type sometimes referred to as "slow hot flashes" or "ember flashes". The standard hot flash comes on rapidly, sometimes reaching maximum intensity in as little as a minute. It lasts at full intensity for only a few minutes before gradually fading.
Slow "ember" flashes appear almost as quickly but are less intense and last for around half an hour. Women who experience them may undergo them year-round, rather than primarily in the summer, and ember flashes may linger for years after the more intense hot flashes have passed.
In younger women
If hot flashes occur at other times in a young woman's menstrual cycle, then it might be a symptom of a problem with her pituitary gland; seeing a doctor is highly recommended. In younger women who are surgically menopausal, hot flashes are generally more intense than in older women, and they may last until natural age at menopause.
Hormone replacement therapy
Hormone replacement therapy may relieve many of the symptoms of menopause. However, HRT may increase the risk of breast cancer, stroke, and dementia and has other potentially serious short-term and long-term risks. The U.S. FDA and women's health advocates recommend[where?] that women who experience troublesome hot flashes try alternatives to hormonal therapies as the first line of treatment. If a woman chooses hormones, they suggest she take the lowest dose that alleviates her symptoms for as short a time as possible.
Selective estrogen receptor modulators
SERMs are a category of drugs that act selectively as agonists or antagonists on the estrogen receptors throughout the body. Tamoxifen, a drug used in the treatment of some types of breast cancer and which can cause hot flashes as a side effect, RAD1901, under development by Radius Health, Raloxifene and the soy-derived Femarelle (DT56a) are examples of SERMs. Menerba, a botanically derived selective estrogen receptor beta agonist currently under development by Bionovo, works like a SERM, but only activates on the estrogen receptor beta.
Selective serotonin reuptake inhibitors
SSRIs are a class of antidepressants most commonly used in the treatment of depression, and some personality disorders. They have been found as efficient in alleviating hot flashes. On June 28, 2013 FDA approved Brisdelle (low-dose paroxetine mesylate) for the treatment of moderate-to-severe vasomotor symptoms (e.g. hot flashes and night sweats) associated with menopause. Paroxetine became the first and only non-hormonal therapy for menopausal hot flashes approved by FDA.
Isoflavones are commonly found in legumes such as soy and red clover. The two soy isoflavones implicated[who?] in relieving menopausal symptoms are genistein and daidzein, and are also known as phytoestrogens. The half life of these molecules is about eight hours, which might explain why some studies have not consistently shown effectiveness of soy products for menopausal symptoms. Although red clover (Trifolium pratense) contains isoflavones similar to soy, the effectiveness of this herb for menopausal symptoms at relatively low concentrations points to a different mechanism of action.
- Ginseng: Very few studies exist on the effect of ginseng for relief of menopausal symptoms. In a large double-blinded randomized controlled trial, reduction in hot flashes was not statistically significant but showed a strong trend towards improvement. Lack of statistical significance suggests future research, but does not meet the scientific bar for ginseng to be deemed effective.
- Flaxseed: There have also been several clinical trials using flaxseed. Flaxseed is the richest source of lignans, which is one of three major classes of phytoestrogen. Lignans are thought to have estrogen agonist and antagonist effects as well as antioxidant properties. Flaxseed and its lignans may have potent anti-estrogenic effects on estrogen receptor positive breast cancer and may have benefits in breast cancer prevention efforts. One recent study done in France, looked at four types of lignans, including that found in flaxseed (Secoisolariciresinol) in a prospective cohort study to see if intake predicted breast cancer incidence. The authors report lowered risk of breast cancer among over 58,000 postmenopausal women who had the third highest quartile of lignan intake. There have been a few small pilot studies that have tested the effect of flaxseed on hot flashes. Currently there is a large study sponsored by the National Cancer Institute that is ongoing, but not accepting any new participants. The rationale for the study is that estrogen can relieve the symptoms of menopause, but can also cause the growth of breast cancer cells. Flaxseed may reduce the number of hot flashes and improve mood and quality of life in postmenopausal women not receiving estrogen therapy.
|This section does not cite any references or sources. (July 2013)|
Lifestyle changes may help alleviate hot flashes. These include avoiding caffeine, hot drinks, chocolate, spicy or hot foods and alcohol.
Hot flashes in men could have various causes. One is a possible sign of low testosterone. Another is andropause, or "male menopause". Men with prostate cancer or testicular cancer can also have hot flashes, especially those who are undergoing hormone therapy with antiandrogens, also known as androgen antagonists, which reduce testosterone to castrate levels. There are also other ailments and even dietary changes which can cause it. Men who are castrated can also get hot flashes.
- European Menopause and Andropause Society
- Hormone replacement therapy
- Menopausal Research and Info Service
- North American Menopause Society, also known as NAMS
- [dead link]
- Utian, Wulf H. (2012-06-01). "Recent Developments in Pharmacotherapy for Vasomotor Symptoms". Current Obstetrics and Gynecology Reports (Current Science Inc.) 1 (2): 43–49. doi:10.1007/s13669-012-0009-4. ISSN 2161-3303. Retrieved April 17, 2013.
- Shanafelt, Tait D.; Barton, Debra L.; Adjei, Alex A.; Loprinzi, Charles L. (November 2002). "Pathophysiology and Treatment of Hot Flashes". Mayo Clinic Proceedings (Elsevier Inc.) 77 (11): 1207–1218. doi:10.1016/S0025-6196(11)61811-9. PMID 12440557.
- Linda Gannon (1985). Menstrual Disorders and Menopause: Biological, Psychological, and Cultural Research. Praeger. ISBN 978-0-03-003878-5. Retrieved 19 April 2013.
- Anna-Clara, Spetz; Zetterlund, Eva-Lena; Varenhorst, Eberhard; Hammar, Mats (November/December 2003). "Incidence and Management of Hot Flashes in Prostate Cancer". The Journal of Supportive Onocology (BioLink Communications) 1 (4): 263–273. Retrieved April 19, 2013.
- [dead link]
- University of Glasgow (24 October, 2007). "Doctors seek the key to understanding hot flushes". University News (Archive of news). University of Glasgow. Retrieved April 19, 2013.
- About.com (n.d.). "Menopause". About.com. Retrieved April 19, 2013.
- U.S. Food and Drug Administration (February 10, 2004). "FDA Updates Hormone Therapy Information for Post Menopausal Women". FDA News Release (Archived content). U.S. Food and Drug Administration. Retrieved April 19, 2013.
- "Radius Initiates Phase 2a Clinical Trial of RAD1901 in Menopausal Hot Flashes Radius Initiates Phase 2a Clinical Trial of RAD1901 in Menopausal Hot Flashes". PR Newswire. PR Newswire Association LLC. March 24, 2009. Retrieved April 20, 2013.
- Yoles I, Lilling G (January 2007). "Pharmacological doses of the natural phyto-SERM DT56a (Femarelle) have no effect on MCF-7 human breast cancer cell-line". Eur. J. Obstet. Gynecol. Reprod. Biol. 130 (1): 140–141. doi:10.1016/j.ejogrb.2006.02.010. PMID 16580119.
- Leitman, D.C., Paruthiyil, S., Vivar, O.I., Saunier, E.F., Herber, C.B., Cohen, I., Tagliaferri, M., Speed, T.P. (December 2010). "Regulation of Specific Target Genes and Biological Responses By Estrogen Receptor Subtype Agonists". Current Opinion in Pharmacology 10 (6): 629–636. doi:10.1016/j.coph.2010.09.009. PMC 3010356. PMID 20951642.
- Sicat, BL; Brokaw, DK (2004 Jan). "Nonhormonal alternatives for the treatment of hot flashes.". Pharmacotherapy 24 (1): 79–93. PMID 14740790.
- Food and Drug Administration (June 28, 2013). "FDA NEWS RELEASE: FDA approves the first non-hormonal treatment for hot flashes associated with menopause". FDA.
- Hani P. Nissan, Jian Lu, Nancy L. Booth, Henry I. Yamamura, Norman R. Farnsworth, Z. Jim Wan. A red clover (Trifolium pratense) phase II clinical extract possesses opiate activity. Journal of Ethnopharmacology 2007; 112:207–210
- Wiklund IK, Mattsson LA, Lindgren R, Limoni C, for the Swedish Alternative Medicine Group. Effects of a standardized ginseng extract on quality of life and physiological parameters in symptomatic post-menopausal women: a double-blind, placebo-controlled trial. Int J Clin Pharmacol Res. 1999;19:89 –99.
- Basch E, Bent S, Collins J, et al. Flax and flaxseed oil (Linum usitatissimum): a review by the Natural Standard Research Collaboration. J Soc Integr Oncol 2007 Summer;5(3):92–105.
- Jugenström, Malin Bergman; Thompson, Lilian U.; Dabrosin, Charlotta (February 1, 2007). "Flaxseed and Its Lignans Inhibit Estradiol-Induced Growth, Angiogenesis, and Secretion of Vascular Endothelial Growth Factor in Human Breast Cancer Xenografts In vivo". Clinical Cancer Research (American Association for Cancer Research) 13 (3): 1061–1067. doi:10.1158/1078-0432.CCR-06-1651. PMID 17289903.
- Touillaud, Marina S.; Thiébaut, Anne C. M.; Fournier, Agnès; Niravong, Maryvonne; Boutron-Ruault, Marie-Christine; Clavel-Chapelon, Françoise (March 21, 2007). "Dietary Lignan Intake and Postmenopausal Breast Cancer Risk by Estrogen and Progesterone Receptor Status". Journal of the National Cancer Institute (Oxford University Press) 99 (6): 475–486. doi:10.1093/jnci/djk096. ISSN 1460-2105. Retrieved April 20, 2013.
- "Flaxseed in Treating Postmenopausal Women With Hot Flashes Who Have a History of Breast Cancer or Other Cancer or Who Do Not Wish to Take Estrogen Therapy". ClinicalTrials.gov. U.S. National Institute of Health. November 2010. Retrieved April 20, 2013.
- Bunyavanich, Supinda (June 6, 2007). "Low Testosterone Could Kill You". ABC News. ABC News Internet Ventures. Retrieved April 20, 2013.
- Holley, Casey L. (August 11, 2011). "5 Things You Need to Know About the Causes of Hot Flashes in Men". Livestrong.com. Demand Media Inc. Retrieved April 20, 2013.
- "What to Expect During Therapy". Lupron Depot. Abbott Laboratories. Retrieved April 20, 2013.
- "Hot Flashes In Men -- Mayo Clinic Researchers Describe A Treatment". ScienceDaily. Science Daily LLC. October 19, 2004. Retrieved April 20, 2013.
- Engstrom, Christine A.; Kasper, Christine E. (March 2007). "Physiology and Endocrinology of Hot Flashes in Prostate Cancer". American Journal of Men's Health (Sage Publications) 1 (1): 8–17. doi:10.1177/1557988306294162. Retrieved April 20, 2013.
- Anitei, Stefan (April 16, 2007). "Men Can Experience Hot Flashes, Just Like Women in Menopause". Softpedia. Softpedia. Retrieved April 20, 2013.
- Messina, Mark; Claude Hughes (2003). "Efficacy of Soyfoods and Soybean Isoflavone Supplements for Alleviating Menopausal Symptoms Is Positively Related to Initial Hot Flush Frequency". Journal of Medicinal Food (Mary Ann Liebert, Inc.) 6: 2. doi:10.1089/109662003765184697.
- Lock, Margaret (May–August 1994). "Menopause in cultural context". Experimental Gerontology (Elsevier Inc.) 29 (3–4): 307–317. doi:10.1016/0531-5565(94)90011-6. PMID 7925751.
- Penotti M, Fabio E, Bachhi A, Rinaldi M, Omodei U, Viganob P (May 2003). "Effect of soy-derived isoflavones on hot flushes, endometrial thickness, and the pulsatility index of the uterine and cerebral arteries". Fertility and Sterility (Elsevier Inc.) 79 (5): 1112–1117. doi:10.1016/S0015-0282(03)00158-4. PMID 12738504.