A bout of breast pain is a possible cause of breast hyperplasia, mastitis and breast cancer. 1. Breast Hyperplasia: Breast Hyperplasia is a benign hyperplastic disease of the breast parenchyma that develops during the development of the female breasts, and patients usually experience symptoms of breast swelling and pain. 2. Mastitis: Mastitis occurs due to excessive filling of the breasts or due to infection secondary to blockage of the milk ducts. The patient will have symptoms such as breast pain and swelling and pus breakout. 3. Breast cancer: Breast cancer is a malignant tumor that occurs in the glandular epithelial tissue of the breast, and patients will experience symptoms such as breast swelling and pain, fatigue and weakness. In addition, breast trauma, herpes zoster, cardiothoracic disease may also appear similar symptoms, when the patient has a bout of pain in the breast, should go to the hospital in time for medical consultation, and after clarifying the cause of the disease, actively cooperate with the doctor’s treatment.