Breast cysts occur when fluid-filled sacs develop in the breast. They develop naturally as the breast ages and changes.
Breast cysts are most common in women who have not reached menopause, although you can develop breast cysts at any age. Women who use hormone replacement therapy (HRT) after menopause may also develop cysts.
Developing one or more cysts, either in one breast or both breasts, is relatively common and there is nothing to worry about. Many women reportedly have cysts without knowing about them. Having a breast cyst does not increase your risk of developing breast cancer.
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