There are small lumps in the breast, which may be breast hyperplasia nodules, breast fibroma, breast cancer, etc. 1. Breast hyperplasia nodule: patients may show cyclic pain, which is heavier before menstruation and relieved after menstruation, or localized nodule with unclear boundary, which is mainly related to sex hormone secretion disorder. 2. Breast fibroma: if the breast fibroma feels smooth, has good mobility, has no adhesion with the surrounding tissues, and may have the symptom of mild tenderness, it may be considered as breast fibroma, which may be caused by high level of estrogen in the body. 3. Breast cancer: due to the stimulation of local formation of hyperplastic lumps after cancer cells invade normal tissues, with hard texture, poor mobility, adherence with surrounding tissues, unclear boundary, and seldom have pain. There may be other reasons for breast lumps, such as mastitis, trauma to the breast, etc. It is recommended to go to the hospital in time, and follow the doctor’s instruction after clarifying the cause of the disease, so as to avoid delaying the condition.