Polymastia: The Condition Where a Woman Has 3 Breasts

Supernumerary breast, also known as accessory breast, polymastia, or polythelia, is a rare congenital condition that affects males or females and often results when a failure occurs in the embryonic development of bréast tissue.

This condition is usually characterised by the presence of two, three, or more bréast tissues other than the usual two most men and women have.

Where are these Mammary tissues located?

According to a publication by Verywell Health, these tissues are usually located along the milk lines—an area of the body that extends from the armpit, down the chest, and to the groyne.

These tissues can also be found in the back, face, or thigh and often resemble the normal pair in terms of size, shape, and nipple appearance.

What causes polymastia?

As stated earlier in the opening paragraph, this condition is believed to have emanated from the disruption of milk line development during the embryonic stage of foetal development in the uterus. Hormonal imbalance, hereditary factors, and genetics are also factors that may contribute to the development of supernumerary bréasts.


What are the Health Risks of Polymastia?

The presence of fully formed bréast tissue, aside from the usual two, can be a pointer to a congenital breast defect, mutation, malignant growth, or tumour, and probably cancer.

How can Polymastia be Corrected?

Individuals who experience discomfort or pain due to the presence of a third bréast tissue may consider treatment options like surgical removal (reduction mammoplasty or mastectomy).

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