Diseases and Conditions
Breast cysts are fluid-filled sacs inside the breast, which are usually not cancerous (benign). You can have one or many breast cysts and they can happen in one or both breasts. They're often described as round or oval lumps with distinct edges. A breast cyst usually feels like a grape or a water-filled balloon, but sometimes a breast cyst feels firm.
Breast cysts don't require treatment unless a cyst is large and painful or uncomfortable. In that case, draining the fluid from a breast cyst can ease symptoms.
Breast cysts are common in women before menopause, between ages 35 and 50. But they can be found in women of any age. They can also occur in postmenopausal women taking hormone therapy.