Hard lumps and pain in the breasts after menstruation can be seen in breast hyperplasia, mastitis, breast cancer, etc., and the specific ways of relief should depend on the situation. 1. Breast enlargement: it is one of the most common benign breast lesions, related to endocrine disorders, mental and psychological state, breast enlargement should be timely to the hospital examination, usually no special treatment, in order to improve the habits of life, to reduce the psychological pressure. 2. Mastitis: It is mainly an inflammatory disease with localized redness, swelling, heat and pain. It occurs during the breastfeeding period and is mostly caused by the stagnation of the milk ducts, and the main treatment is to discharge the stagnant milk, and anti-infective treatment, such as cephalosporin antibiotics. 3. Breast cancer: Usually, the nodules of breast cancer do not cause pain, but if the nodules are too big and invade the nerves, it will cause pain, and the main treatment method is surgery. The main treatment method is surgery. Breast lumps and pain after menstruation are usually seen in breast hyperplasia, but it is recommended that patients need to consult a doctor in time, and standardize the treatment under the guidance of the doctor after a clear diagnosis.