Breast cysts, fibrocystic breasts, mammary dysplasia, and benign breast disease are all synonyms for the term "cystic disease of breast." This condition is characterized by the development of fluid-filled sacs (cysts) in the breast tissue. It can affect women of any age, but is more common in those who are pre-menopausal. Symptoms of cystic disease of breast include breast pain, tenderness, and lumpiness. While this condition is non-cancerous, it is important for women to regularly monitor their breasts and report any changes or abnormalities to their healthcare provider. Treatment options can include pain relief medications, hormone therapy, or surgical removal of the cysts.