There is a big hard lump inside the breast, considering the following reasons: 1, breast hyperplasia, the most typical symptoms of breast lumps, breast pain and nipple overflow, etc., mostly related to endocrine disorders, especially in the pre-menstrual period, the hard lumps will become harder, bigger, painful, and after the end of the menstrual period, it will be gradually relieved; 2, lactation breast milk is not discharged in time to clog up the mammary glands, the formation of breast milk stasis, the need to promptly rub the hard lumps to avoid the formation of mastitis or even breast abscess; 3, breast cancer, especially in the advanced stage of breast cancer, there will be hard lumps, pain, swelling in the armpit, and so on. The hard lumps need to be rubbed out in time to avoid the formation of mastitis or even breast abscess; 3. Breast cancer, especially in the late stage of breast cancer, will have symptoms such as hard lumps, pain, and enlarged axillary nodes; 4. Breast fibroids and other conditions of breast nodules, go to the hospital breast specialists to have an imaging examination as early as possible to avoid the delay of the optimal time for treatment.