Breast Cysts

What is a breast cyst?

A breast cyst is a fluid-filled sac inside the breast which are usually benign (not cancerous). Cysts can be single or multiple. They can change with the menstrual cycle and can come and go.

How common are breast cysts?

Breast cysts are very common, particularly in women in the 30 to 50 year old age group. Cysts usually disappear after the menopause, but in some women they can last throughout life.

How are breast cysts diagnosed?

Most women have only tiny (a few millimetres) cysts that cannot be felt and cause no symptoms. When they become large, they can be felt as round or oval lumps that are smooth and move easily. If they fill with a lot of fluid and become tense, they may feel firm. Cysts are often tender. Even if there is no distinct lump to feel, breast tissue that contains cysts may feel tender.

Very commonly, small cysts are picked up on an ultrasound performed for other reasons. Sometimes they can be seen on a mammogram.

Do breast cysts need to be treated or investigated?

Cysts that cause no symptoms and show benign (non-cancerous) features on imaging require no treatment. The majority of cysts will fit into this category. Cysts that are large or do not show typical features will need further investigation or treatment. Dr Graham will discuss the appropriate investigations and treatments that are required in your case.