Early symptoms and precursors of breast cancer include breast lumps, skin changes, nipple abnormalities, nipple overflow and so on. 1. Breast lump: Early breast cancer can be felt in the patient’s breast as a small hard lump, most of which are painless. The shape of the lump is irregular, the edge is not clear, and it is not easy to be pushed in the breast. 2. Skin changes: with the development of the tumor, if it violates the suspensory ligament of the breast, the skin around the breast will have localized dimpling and orange peel-like changes. 3. Nipple abnormality: the nipple is pulled by the lump in the early stage of breast cancer, which makes the nipple sink inward and retract. 4. Nipple overflow: the female breast will not produce milk when it is not breastfeeding. In the early stage of breast cancer, the nipple will spontaneously discharge milky white, bloody, yellowish and other watery or plasma liquids. In addition, breast cancer may also present symptoms such as breast pain and swollen lymph nodes in the armpit. Patients are advised to go to the hospital in time when they have uncomfortable symptoms to avoid delaying their condition.