A lump in the breast can be seen as a result of a variety of diseases, such as breast hyperplasia, breast fibroma, breast cancer and so on. 1. Mammary hyperplasia: It is a common benign breast disease, which can also be seen in men. It can be caused by endocrine disorders, psychosocial factors and other factors, and the main symptoms can be seen as breast pain, breast lumps and so on. 2. Breast fibroma: it is a kind of benign tumor occurring in the breast, which can be caused by pregnancy, drugs and other factors. The main symptom can be seen as painless breast lumps with clear and movable edges. 3. Breast cancer: it is a kind of malignant tumor occurring in the breast, which can be caused by heredity, obesity and other factors. The main symptoms can be manifested as breast lumps, nipple discharge, orange peel-like lesions and so on. If there is a lump protruding from the breast, you should go to the hospital in time for hospital-related examinations to clarify the cause of the disease and actively cooperate with the doctor’s treatment.