The causes of female breast pain are many, including the following: 1. Considered to be caused by breast hyperplasia, especially during menstruation due to excessive secretion of estrogen and progesterone, coupled with emotional changes and poor diet. 2. Considered to be caused by mastitis, especially during lactation, which can cause severe pain. 3. 4. It may be caused by malignant breast cancer, especially in the middle and late stages of the disease, and the pain is severe and affects life and work.