A hard lump inside the breast may be related to breast milk stagnation, breast cancer, breast fibroadenoma and other factors. It is recommended to consult a breast surgeon in time and treat it after the cause is clarified under the doctor’s guidance. 1. Milk stagnation: It is common in breastfeeding women, due to various reasons, the milk ducts are blocked, and the milk can not be discharged out of the body in a timely manner, resulting in the phenomenon of milk stagnation. When touching the breast, you can feel the obvious hard lumps. Under the guidance of the doctor, local massage and physical therapy can be carried out to make the milk ducts smooth and improve the related symptoms. 2. Breast Cancer: It is a tumor disease caused by various reasons, which leads to uncontrolled proliferation of the epithelial skin of the breast, thus causing malignant changes. Clinically, it will lead to the phenomenon of hard lumps in the breast area, and it is recommended to consult a doctor in time. Under the guidance of the doctor for surgical treatment, after the operation need to carry out radiotherapy, chemotherapy and other treatments. 3. Breast fibroadenoma: caused by the abnormal sensitivity of breast fibroblasts to estrogen, usually painless, movable breast lumps, commonly found in young women, which is a benign disease of the breast. It is a benign disease of the breast. Fibroadenomas can be removed surgically under the guidance of a doctor after completing the relevant examinations. Therefore, if you have any abnormalities in your breasts, you should consult a doctor in time to clarify the cause of the disease and then carry out the appropriate treatment.