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Home > Women's Health > Breast Conditions > Breast Cysts: Causes, Symptoms, Treatment, and Self-Care

Breast Cysts: Causes, Symptoms, Treatment, and Self-Care

May 4, 2020 - Updated on June 9, 2022
5 min read
By Rachel Wellner, MD, MPH, FACS | Breast Surgeon

In this article:

  • Causes of Breast Cysts
  • Manifestations of Breast Cysts
  • Treatment for Breast Cysts
  • Self-Care Tips for Breast Cysts
  • Prevention of Breast Cysts
  • Difference Between a Cyst and a Tumor
  • Can a Cyst in the Breast Turn Into Cancer?
  • Final Word

The breast is a complex gland consisting of ducts, lobules, connective tissue, and fat. On average, a typical breast contains 12–15 major lobules and ducts, which carry milk out through the nipple during lactation.

breast cysts

Generally, when there is an outpouching of the duct, a cyst forms. The cyst can remain in continuity with the duct or can “pinch off” and form a separate entity.

A breast cyst is a fluid-filled sac located in the breast, usually containing greenish, straw-colored, or brownish fluid. They are generally round with smooth edges containing fluid. (1)

Causes of Breast Cysts

The cause of breast cysts is unclear but their formation is likely related to hormonal changes in the body. They are more common in premenopausal women (women of reproductive age) than in women of other age groups.

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The cysts tend to become tender and/or larger around menses and pregnancy. If the cysts are removed surgically, they generally do not recur, but people prone to breast cysts can develop new ones.

Manifestations of Breast Cysts

Breast cysts are smooth, palpable lumps with distinct borders. Sometimes they are completely asymptomatic and only discovered when a woman goes for her routine imaging (mammography, sonography). Other cysts can be large and painful, especially around menses or pregnancy.

Treatment for Breast Cysts

can breast cysts go away on their own?

A breast cyst can either resolve on its own or last through the reproductive years. In some cases, the cysts may even remain throughout the lifetime of a patient, but they are generally not dangerous.

However, they can grow large (>2 cm), at which point they may be painful and warrant treatment.

  • If a patient is experiencing discomfort and the cyst is readily palpable, it can be drained using a typical syringe and a medium-bore to a large-bore needle.
  • If the cyst is deeper, nonpalpable, or painful, aspiration can be performed by the breast imager using the same technique, but relying upon the ultrasound as a guide to find the cyst.
  • The cysts can reaccumulate fluid after being drained. If the cyst fluid reaccumulates more than twice or is bloody, the fluid should undergo cytologic testing to ensure it is not a rare presentation of cancer.
  • Clearly, if the aspirate is concerning for malignancy or premalignancy, the mass should be excised with appropriate margins. (2)

Self-Care Tips for Breast Cysts

self-care tips and remedies for women with a breast cyst

There is no evidence showing the efficacy of a home remedy for breast cysts. However, the following things are believed to help with the symptoms:

  • Evening primrose oil may be effective at reducing the pain caused by a breast cyst and/or cystic breasts. It is thought to have mild anti-inflammatory and analgesic properties. (3)
  • This is controversial, but foods high in estrogen, such as all soy products (phytoestrogens), should be minimized or avoided in the adult patient.

Prevention of Breast Cysts

It is unclear how to prevent breast cysts. They are not dangerous in and of themselves, so prevention is not the key issue here. The key issue is whether or not to aspirate or resect them or to just observe them, ensuring they do not change significantly over time or obscure an adjacent tumor. (4)

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Difference Between a Cyst and a Tumor

differences between breast tumor and breast cyst

A cyst on physical exam presents as a smooth mass with distinct borders, whereas a malignancy generally feels like a firm, nonmovable mass with indistinct or “rough” borders. 

In contrast to a benign breast cyst, a cancerous mass may also manifest puckering of the skin, nipple inversion, tumescent skin (peau d’orange skin), skin dimpling, asymmetries, redness or inflammatory changes, and/or enlarged axillary lymph nodes (the lymph glands under the armpits). 

On a mammogram, the cyst will look like a perfectly smooth, balloon-like mass, whereas malignancies can show as calcifications or what’s called a “spiculated mass,” where it appears to almost be “sucking” the tissue around it.

On ultrasound, a cyst is a fluid-filled sac, whereas malignancies have their own typical appearance (taller rather than wide, ill-defined borders). The shadowing pattern on ultrasound is also characteristic of malignancy. (5)

Can a Cyst in the Breast Turn Into Cancer?

While breast cysts may be inconvenient and uncomfortable, they are rarely if ever dangerous and do not represent a risk factor for breast cancer. A breast cyst technically can turn into cancer or represent cancer at presentation.

The bigger problem occurs when the patient has a cyst that appears as a mass on the exam and makes it difficult to recognize a concomitant malignancy (malignancy occurring at the same time as a cyst). (6) Both on physical exam and imaging, a breast cyst can obscure an underlying cancerous mass.

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Final Word

Breast cysts refer to round or oval sac-like presentations in the breast that are filled with fluid. While they are generally nonproblematic, they may grow over time and cause pain, lumpiness, and tenderness in the breast.

It is advised to get yourself checked by a doctor if you feel any lump in your breast, as it may be a cyst or even cancer. The treatment for cysts, if required, depends on its cause and risk level.

References
  1. Voyvoda N. Simple breast cysts: should we treat or not? Diagnostic and interventional radiology (Ankara, Turkey). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5214084/. Published 2017.
  2. Ponka D, Baddar F. Breast cyst aspiration. Canadian family physician Medecin de famille canadien. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498021/. Published November 2012.
  3. Mansel RE, Das T, Baggs GE, et al. A Randomized Controlled Multicenter Trial of an Investigational Liquid Nutritional Formula in Women with Cyclic Breast Pain Associated with Fibrocystic Breast Changes. Journal of women’s health (2002). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865258/. Published March 2018.
  4. Bhate RD, Chakravorty A, Ebbs SR. Management of breast cysts revisited. International journal of clinical practice. https://www.ncbi.nlm.nih.gov/pubmed/17263706. Published February 2007.
  5. Ikeshima A, Ozawa M, Yamamoto H, Araki M, Sairenji E. Differential diagnosis between cyst and tumor. Dentigerous cyst and ameloblastoma containing teeth. The Journal of Nihon University School of Dentistry. https://www.ncbi.nlm.nih.gov/pubmed/2345376. Published March 1990.
  6. Houssami N, Irwig L, Ung O. Review of complex breast cysts: implications for cancer detection and clinical practice. ANZ journal of surgery. https://www.ncbi.nlm.nih.gov/pubmed/16398815. Published December 2005.

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