There is a hard lump at the bottom of the breast without pain, which should be consulted in time and alerted to be the manifestation symptoms of certain diseases, such as breast fibroid, breast cancer, breast lipoma and other diseases. 1. Breast fibroma: most of them are painless lumps in the breast, only slight pain before menstruation, even nipple overflow; the boundary of the lump is clear, the surface is smooth, and the lump can be moved when pushed. 2. Breast cancer: most of them start to manifest as breast lumps, but when the lumps appear, there is no pain at the beginning; they may be accompanied by nipple discharge, skin changes (e.g. chicken-skin-like changes, breast indentation), skin ulceration, etc. 3. Mammary gland lipoma: it is often single, mainly manifested as round, oval, or irregular lobulated lumps with clear boundary, soft texture, and diameter of 3~5 cm, and most of them do not have obvious self-conscious symptoms. This symptom alone is not enough to diagnose the disease, and it is not excluded that it is caused by other factors. It is recommended that the patient should consult the doctor in time, so that the doctor can clarify the cause of the disease and give targeted treatment.