|Classification and external resources|
Ultrasound scan showing a small cyst in the breast
A breast cyst is a fluid-filled sac within the breast. One breast can have one or more breast cysts. They're often described as round or oval lumps with distinct edges. In texture, a breast cyst usually feels like a soft grape or a water-filled balloon, but sometimes a breast cyst feels firm.
Breast cysts can be painful and may be worrisome but are generally benign. They are most common in pre-menopausal women in their 30s or 40s. They usually disappear after menopause, but may persist or reappear when using hormone therapy. Breast cysts can be part of fibrocystic disease. The pain and swelling is usually worse in the second half of the menstrual cycle or during pregnancy.
Treating breast cysts is usually not necessary unless they are painful or cause discomfort. In most cases, the discomfort they cause may be alleviated by draining the fluid from the cyst. The cysts form as a result of the growth of the milk glands and their size may range from smaller than a pea to larger than a ping pong ball. Small cysts cannot be felt during a physical examination, and some large cysts feel like lumps. However, most cysts, regardless of their size cannot be identified during physical exams.
The cystic nature of a breast lump can be confirmed by ultrasound examination, aspiration (removal of contents with needle), or mammogram. Ultrasound can also show if the cyst contains solid nodules, a sign that the lesion may be pre-cancerous or cancerous. Examination by a cytopathologist of the fluid aspirated from the cyst may also help with this diagnosis.
Commonly, cysts are detected with the help of mammograms. However, the medical history and physical examination also play an important role in establishing an accurate diagnosis. During these tests, the doctor will try to find out as much information as possible regarding the symptoms the patient has experienced, their intensity and duration and the physical examination is performed regularly to check for other abnormalities that may exist within the breast.
As mentioned above, cysts are often undetectable at touch. Therefore, a mammogram can provide valuable and clear images of the breast tissue. Generally, if there is any abnormality within the breast tissue, it will be shown on the mammogram. There are two types of mammograms available. One of them is primarily used in screening, and are ordered for patients who do not show any symptoms and these are called screening mammograms. Diagnostic mammograms are used on patients who developed certain symptoms of a breast condition or in patients whose screening mammograms showed abnormalities.
Patients suspected of breast cysts will normally be given a diagnosing mammogram, although they are not suspected of cancer. This type of mammogram provides the doctor with the possibility of performing a breast ultrasound at the same time and this is the reason why they are often preferred over the screening mammograms. Breast ultrasound is considered the best option when diagnosing breast cysts because it is 95 to 100% accurate, it provides a clear image on the cyst's appearance (simple or complex) and it may also distinguish between solid lumps and fluid-filled cysts, which a mammogram cannot do. Breast ultrasounds are performed with the help of a handheld medical instrument which is placed on the skin, after a special type of fluid has been applied on it. The instruments picks up the echo resulted from the sound waves it sends to the breast. These echoes are transmitted to a computer which translates it into a picture.
Most simple cysts are benign and do not require any treatment or further diagnostic workup. Some complex cysts may require further diagnostic measures such as fine needle aspiration or biopsy to exclude breast cancer however the overwhelming majority is of benign nature. Cysts will usually resolve on their own after the fluid is drained. Otherwise, if the lump is not a cyst, the fluid aspirated may contain blood or there may not be fluid at all. Whereas in the first case, the fluid is sent to the laboratory for further examination, the latter circumstance is a sign that the breast lump is solid. This type of tumor needs to be biopsied in order to determine whether it is malignant or benign.
Signs and symptoms of breast cysts include:
- A smooth, easily movable round or oval breast lump with distinct edges
- Breast pain or tenderness in the area of the lump
- Increased lump size and tenderness just before your period
- Decreased lump size and resolution of other signs and symptoms after your period
- Having one or many simple breast cysts doesn't increase your risk of breast cancer.
Lumps in the breast are often not found during self-examinations or physical exams. However, in some cases they can be felt at touch, especially if they are larger.
Breast cysts don't require treatment unless a cyst is large and painful or otherwise uncomfortable. In that case, draining the fluid from a breast cyst can ease your symptoms.
Draining the fluid and then waiting for the cyst to resolve it is the main treatment applied in these cases. Moreover, cysts that are aspirated and the fluid looks normal do not require any other medical attention apart from following-up to make sure it completely disappeared. Yet, hormone therapy by the means of oral contraceptives is sometimes prescribed to reduce their recurrence and to regulate the menstrual cycle of the patient (which is likely to cause them in the first place). Danazol may also be prescribed to treat this condition and it is usually considered in patients on whom the non-medical treatment fails and the symptoms are intense.
Surgical removal of a breast cyst is necessary only in a few unusual circumstances. If an uncomfortable breast cyst recurs month after month, or if a breast cyst contains blood-tinged fluid and displays other worrisome signs, surgery may be considered.
The development of breast cysts may be prevented to some degree, according to the majority of the specialists. The recommended measures one is able to take in order to avoid the formation of the cysts include practicing good health and avoiding certain medications, eagluten or lactose may also contribute to cyst development. Eating a balanced diet, taking necessary vitamins and supplements, getting exercise, and avoiding stress.
Although caffeine consumption does not have a scientifically proved connection with the process of cyst development, many women claim that their symptoms are relieved if avoiding it. Some doctors recommend reducing the amount of caffeine in one's diet in terms of both beverages and foods (such as chocolate). Also reducing salt intake may help in alleviating the symptoms of breast cysts, although, again, there is no scientific linkage between these two. Excessive sugar consumption as well as undetected food allergies, such as to
Cysts and bra support
Some women experience breast pain, especially when engaging in vigorous physical activity. A properly fitted sports bra, which compresses or encapsulates breast tissue, is designed to reduce pain caused by exercise. 
Some women with breast cysts experience increased comfort and less pain by not wearing a bra. Robert Mansell, a professor of surgery at the University Hospital of Wales, in Cardiff, and Simon Cawthorn, consultant surgeon at Bristol's Frenchay Hospital, studied 100 women with breast cysts. Cawthorn said, "What we were looking at was whether wearing a bra would increase the number of cysts, and whether it affected their breast pain." The women kept track of their breast pain for three months while wearing a bra, and three months braless. The researchers found "they still had lots of cysts, but that wearing a bra didn't actually cause cysts, which is interesting as it had been suggested that there is such a link." They documented a seven percent reduction in breast pain for women who didn't wear a bra, a reduction to 23 percent from 30 percent.
- "Breast Cysts". Retrieved 2010-06-25.
- Daly CP, Bailey JE, Klein KA, Helvie MA (May 2008). "Complicated breast cysts on sonography: is aspiration necessary to exclude malignancy?". Acad Radiol 15 (5): 610–7. doi:10.1016/j.acra.2007.12.018. PMID 18423318.
- "What are breast cysts?". Retrieved 2010-06-25.
- "Tests and diagnosis". Retrieved 2010-06-25.
- "Treatments and drugs". Retrieved 2010-06-25.
- "Breast Cyst Treatment Alternatives". Retrieved 2010-06-25.
- Greenbaum AR, Heslop T, Morris J, Dunn KW (April 2003). "An investigation of the suitability of bra fit in women referred for reduction mammaplasty". British Journal of Plastic Surgery 56 (3): 230–6. doi:10.1016/S0007-1226(03)00122-X. PMID 12859918.
- Hadi MS (November 2000). "Sports Brassiere: Is It a Solution for Mastalgia?". The Breast Journal 6 (6): 407–409. doi:10.1046/j.1524-4741.2000.20018.x. PMID 11348400.
- Mason BR, Page KA, Fallon K (June 1999). "An analysis of movement and discomfort of the female breast during exercise and the effects of breast support in three cases". Journal of Science and Medicine in Sport 2 (2): 134–44. doi:10.1016/S1440-2440(99)80193-5. PMID 10476977.
- Stuart, Julia (November 2, 2000). "Don't burn your bra just yet". The Independent. Retrieved 4 February 2012.