Generally speaking, hard lumps in the breasts with pain after menstruation do not exclude the existence of pathological factors in the breast, such as breast nodules, breast hyperplasia, mastitis and other conditions. 1. Breast nodule: it may be caused by endocrine disorders, environmental influences or genetic mutations, etc. Most of the patients with breast nodule are accompanied by cyclic pain, and most of them can directly touch the hard lumps with their hands. 2. Breast hyperplasia: patients with breast hyperplasia are the first to feel pain in the breast, and some of them can touch the lump. 3. Mastitis: It can be categorized into lactation and non-lactation mastitis, and it is possible that hard lumps of pain in the breasts after menstruation are non-lactation mastitis. If there is a lump in the breast with pain after menstruation, you need to go to the hospital for breast ultrasound and molybdenum target examination in time. If there is any abnormality, it is necessary to carry out the appropriate treatment under the guidance of the doctor, and should be carried out every year for breast-related physical examination.