A small number of patients with breast cysts may have nipple discharge, which is mostly plasma or blood. Breast cysts are most common in middle-aged women. Tissue hyperplasia can occur around the ducts of the breast and form cysts of varying sizes, with yellowish or brownish fluid inside the cysts; they can also show hyperplasia in the ducts along with cystic dilatation of the ducts. The main clinical manifestations of breast cysts are unilateral or bilateral breast swelling and pain and lumps, and a few patients may have nipple discharge, mostly plasma or plasma-blood fluid. For this disease, it can be treated by puncture and fluid extraction or surgical excision, and it is recommended that patients with breast cysts go to regular hospitals in time and receive treatment according to the doctor’s instructions, so as to avoid delays in the condition.