Breast cysts are usually painful. Breast cysts are usually due to cystic hyperplasia of the breast, which is characterized by swelling and pain in one or both breasts, as well as the presence of lumps in the breasts, and the pain is cyclical. Physical examination usually reveals single or multiple firm nodules of different sizes in both breasts, which may be tender to the touch. Breast pain is usually more pronounced before menstruation and may decrease after menstruation. This is a benign disease with a long, slow progression, and can be treated with tamoxifen for patients with severe symptoms. The above medications should be used under the supervision of a physician.