Breast tenderness with hard lumps can be seen in breastfeeding and can be improved by applying heat. In non-lactating women, it can be seen in acute mastitis, mastopexy and breast tumor. Patients can check the size and mobility of their breast lumps and whether they are accompanied by fever, chills and other systemic symptoms. It is recommended to seek medical attention in a timely manner to avoid delaying the condition: I. Physiological: Some women may experience breast swelling, tenderness and hard lumps during ovulation, premenstruation, pregnancy and lactation due to changes in hormone levels in the body. These symptoms are mostly physiological changes and will be relieved by themselves after the end of menstruation or pregnancy and breastfeeding, so there is no need for treatment. It is recommended to maintain psychological relaxation, pay attention to a light diet, ensure sufficient sleep and appropriate exercise, which can play a certain role in relieving the pain. Pathological: 1. Milk stagnation: Patients are often accompanied by breast swelling and pain, hard lumps, you can use a hot towel to warm the breast before each breastfeeding, while gentle massage. It is recommended that breastfeeding women tolerate the pain at the beginning of breastfeeding, and the situation will improve after several times of breastfeeding. Milk stagnation can easily cause bacterial reproduction, and it is recommended to suck out part of the excess milk with a breast pump after each breastfeeding, and it is not recommended to drain the milk to avoid stimulating milk secretion; 2. Acute mastitis: mostly developed from milk stagnation, in addition to breast swelling and pain and hard lumps, it can be accompanied by breast redness, swelling and fever. Early treatment with penicillin, benzocillin sodium, cefradine, etc., usually also need to suck out the milk to avoid milk stagnation; 3, breast hyperplasia: breast pain, nodules, lumps and nipple overflow as the main symptoms, can be accompanied by anxiety or depression symptoms. If the symptoms are mild, oral treatment such as prolotherapy and mastication can be taken. If the symptoms are severe, surgery can be performed to remove the hyperplasia; 4. It is recommended to seek medical advice for a clear diagnosis and treatment is based on surgical removal of the tumor, if necessary, the whole breast tissue can be removed and corresponding radiotherapy and other treatments can be given; 6.Other: such as breast abscess, chest trauma, etc., may lead to hard lumps in the breast, which need to be treated symptomatically by the nail and breast surgery.