Hard lumps in the breast may be caused by breast hyperplasia, breast enlargement, breast fibroma, breast tuberculosis, breast cancer and so on. 1. Breast hyperplasia: hard lumps caused by breast hyperplasia are pushable and accompanied by slight tenderness, which will be more obvious before menstruation, and after menstruation, the tenderness and hard lumps will be reduced. 2. Breast fibroid: if the lumps are multiple and smooth, without pain and can be pushed back and forth, it is generally considered as breast fibroid, and the size has no obvious relationship with the menstrual period. 3. Breast tuberculosis: generally from a hard lump slowly grows to more than one hard lump, there is no pressure pain will be connected with the skin. 4. Breast cancer: generally a single fixed small lump, hard texture, no pressure and pain, and adhesion to the surrounding skin in the absence of obvious boundaries, considered as breast cancer. Patients who have hard lumps in the breast should consult the doctor in time and be treated actively after a clear diagnosis.