A hard lump in the breast accompanied by pain may be related to breast hyperplasia, mastitis, breast cancer and other factors. 1. Breast Hyperplasia: Usually, during the premenstrual period, the hormone level changes in women’s body cause excessive proliferation of breast tissue, and the pain symptoms will be aggravated, and after the menstrual period is over, the pain symptoms will be alleviated. No special treatment is needed and the pain can be relieved on its own. 2. Mastitis: Mastitis patients may have lumps with pain, which are usually caused by the accumulation of excess milk or bacterial infection. It is usually caused by the accumulation of excess milk or bacterial infection. It often occurs in breastfeeding women. 3. Breast Cancer: Early breast cancer patients usually have painless lumps, when breast cancer patients have lumps with pain symptoms, they should pay attention. It is suggested that patients should seek medical treatment in time. In addition, trauma to the breast and other conditions can also lead to hard lumps in the breast and pain when pressed, it is recommended to consult a doctor in time to clarify the cause of the disease, and under the guidance of the doctor to deal with it accordingly.