Patients should pay attention to the following conditions when they find them unintentionally or during self-examination and go to the hospital in time for early diagnosis and treatment. Breast lumps: Breast lumps are the main form of breast tumors. When lumps are found, patients should go to the hospital in time to confirm the nature of the lumps through comprehensive diagnosis and treat them symptomatically. It takes more than 2 years for a breast cancer lump with a diameter of 1 cm to be clinically felt to form. Breast lumps are also seen in breast hyperplasia, breast tuberculosis, etc. Breast pain: Severe pain in the breast with tenderness is commonly seen in acute mastitis and breast abscess. If the pain is related to the menstrual cycle, aggravated during the premenstrual period and relieved during the postmenstrual period, and if a lump of indeterminate size and boundary is felt and painful when pressed, the clinical diagnosis is generally mastopexy. Third, nipple overflow: Most of the non-lactating nipple overflow in women is pathological, most commonly intraductal papilloma, followed by cystic hyperplasia of the breast and ductal dilatation. If the nipple overflow is a single-hole bloody overflow and the age is above 40 years, breast cancer is more likely. Breast skin changes, nipple changes, axillary lymph node enlargement, upper arm edema: Most of the breast skin does not change during the breast disease period, but breast cancer patients may have breast skin sunken into “dimple-like” or orange peel-like changes, defective or elevated breast curves, asymmetric nipples on both sides, unilateral nipple elevation, long-lasting nipple erosion, and lymph node enlargement on the upper arm. Patients may have swollen axillary lymph nodes, edema in the upper arm, etc.