Breast nodule pain can be caused by physiological reasons, breast hyperplasia, mastitis, breast cancer and so on. 1. Physiological reasons: when there is too much pressure, mental tension, menstrual cycle, etc., it is easy to lead to the phenomenon of breast nodule pain, which is a normal physiological phenomenon. 2. Breast hyperplasia: When you suffer from breast hyperplasia, you are prone to breast nodule pain, and it is also accompanied by breast pain. 3. Mastitis: If the patient’s breast is inflamed, it may also cause the breast tissue to proliferate into nodules, and the obvious inflammation will cause painful symptoms. 4. Breast cancer: For some patients with advanced malignant tumor of the breast, it may lead to breast nodule pain due to the invasion of tumor tissues into the muscles and nerves of the chest wall. Breast nodule pain may also be caused by trauma, etc. Patients with breast nodule pain should go to the hospital in time to clarify the specific cause and follow the doctor’s instructions for treatment.