Touching a lump inside the breast may be caused by breast hyperplasia, breast fibroadenoma or breast cancer. 1. Breast hyperplasia: due to hormonal disorders in the body, resulting in excessive proliferation of the mammary glands, ductal dilatation caused by the lumps, which may appear as a symptom of breast swelling and pain, tingling. 2. Breast fibroadenoma: Breast fibroadenoma is common among young women, usually round or round, with smooth edges, good mobility and slow growth. 3. Breast Cancer: Breast cancer is common among middle-aged and old-aged women. Breast lumps can expand rapidly in a short time, and the lumps are hard, not easy to be pushed, not smooth surface, and generally no obvious pain and other symptoms. Patients with a lump inside the breast, after excluding non-physiological causes, should go to the regular hospital in time to identify the cause of the disease, under the guidance of professional doctors to take targeted treatment.