The possibility of breast pain after six months of breastfeeding is high, and the common ones are mastitis, breast hyperplasia, breast fibroids, breast cysts, and breast cancer, etc. It is necessary to further improve the examination in order to clarify the cause. 1. Mastitis: There is a possibility of mastitis after half a year of weaning, although there is no milk stasis, but if there is a nipple rupture bacterial invasion can also lead to mastitis, mildly hidden pain, severe cases can appear obvious red, swollen, hot and painful symptoms. 2. Mammary gland hyperplasia: It is associated with endocrine disorders and is an abnormal proliferation of breast tissue, and patients may experience symptoms of breast pain. There is a certain pattern of pain, for example, the pain is aggravated before menstruation and relieved after menstruation. 3. Breast fibroma: Breast fibroma is a benign tumor in clinic, which is mostly solitary and has no obvious pain, but a few patients may also have hidden pain symptoms. 4. Breast cysts: mostly related to high estrogen level in the body and blockage of breast ducts, which may cause breast lumps and swelling and pain. 5. Breast cancer: mostly painless and progressive enlargement of breast lumps, some patients may also have hidden pain symptoms. It is recommended that the patient should consult a doctor in time, and be given breast ultrasound and other relevant examinations to clarify the cause of the disease, and then be given appropriate treatment measures by a professional doctor.