A hard lump in the breast that hurts a little when pressed may be an inflammatory breast lump, or it may be caused by breast hyperplasia or breast cancer. 1. Inflammatory breast lumps: the onset is mainly due to the nipple skin breakage, so that the bacteria invade the mammary ducts, invasion of mammary gland tissue, a large number of bacterial breeding, the emergence of mastitis reaction. It can be manifested as a hard lump in the breast and a little pain when pressed. 2. Mammary gland hyperplasia: a benign disease, caused by heredity, diet, environment and endocrine hormone disorders, clinical manifestations of breast swelling and pain before and after menstruation, accompanied by hard lumps. After menstruation, the symptoms will gradually decrease and disappear. 3. Breast Cancer: In the early stage of breast cancer, it usually manifests as a painless lump, and after the tumor volume increases, it will invade the local nerves, resulting in breast pain and discomfort, accompanied by hard lumps. Breast hard lumps are also considered trauma, benign tumors and other reasons, it is recommended to go to the regular hospital in a timely manner, after a clear diagnosis, follow the doctor’s instructions for symptomatic intervention.