The typical symptoms of breast cancer are as follows: 1) breast lump: mostly painless lump is the first symptom; 2) skin indentation: dimple sign and orange peel-like appearance of skin edema and adhesion; 3) nipple indentation: nipple retraction and deviation from the center of the areola; 4) nipple overflow: especially bloody overflow; 5) accompanied by enlarged lymph nodes in the ipsilateral axilla. The atypical symptoms of breast cancer are as follows: 1. no lump: such as inflammatory breast cancer, occult breast cancer and eczema-like breast cancer; 2. lump characteristics are not obvious: for example, breast cancer during pregnancy or lactation is difficult to touch, the lump has a thick texture or a tough or soft texture, and some of the lump borders are clear; 3. multiple lumps: 2% of breast cancers show multiple lumps; 4. other manifestations: such as skin redness and swelling, nipple with other manifestations such as skin redness and swelling, eczema change in nipple, etc.