A hard lump in the breast may be a physiological lump, acute mastitis, cystic hyperplasia of the breast, fibroadenoma of the breast, breast cancer and so on. 1. Physiological lumps, most often seen during puberty, estrogen levels increase, appearing breast hard lump-like changes, is a normal physiological phenomenon, does not require special treatment. 2. Acute mastitis, most common in breastfeeding women, is an acute purulent infection of the breast tissue, with only breast swelling and pain in the early stages and the formation of hard lumps in the breasts, accompanied by localized elevated skin temperature. Generally, antibiotics such as cefdinir are used for treatment, and if an abscess is formed, an abscess incision and drainage will be performed. 3.. Cystic hyperplasia of the breast, which occurs in women of childbearing age, is characterized by periodic pain in the breast accompanied by the formation of hyperplastic nodules. The degree of pain and the size of the nodules change with the menstrual cycle, i.e., it is aggravated during menstruation and relieved after menstruation. When the symptoms are not obvious, oral treatment can be symptomatic, most of them can be relieved, if the drug treatment is ineffective, surgical excision of the mass should be considered. 4. Breast fibroma, which is more common among young people, manifests itself as a lump in the breast and can be painful. On physical examination, the surface of the lesion is smooth, with clear boundaries and good mobility. Ultrasonography will find a lump with intact periphery, if the lesion increases gradually, surgical excision can be chosen as the treatment method. 5. Breast cancer has no obvious characteristic performance in the early stage, but in the late stage, irregular shape, hardness and poor mobility lumps can be touched in the breast, accompanied by the orange peel sign or dimple sign, and once diagnosed, radical breast cancer surgery should be carried out actively. It is recommended that patients with hard lumps in the breast should go to the hospital in time and be treated accordingly under the professional guidance of doctors.