Generally speaking, if there is no abnormality in the overall shape of the breasts, skin surface condition and nipple areola, and there is no lump, nipple overflow or enlarged lymph nodes, etc., it means that the breasts are healthy. Healthy and normal breasts usually show that both breasts are regular in shape and symmetrical in size when standing, no obvious limited bulge or skin depression, normal skin color, no redness or other changes, both nipples are at the same level, no nipple inversion, no erosion of nipple and areola, and no spillage when squeezing the nipple, and so on. Use one hand to touch the opposite side of the breast without lumps, and the touch texture is soft and elastic. Under normal circumstances, there is no lump in the armpit, and there is no localized protruding parastomia from the armpit to the breast. Breast ultrasound is of greater value in the accurate localization of small lesions and tumors that occur, and it can also provide a reference for the benign or malignant nature of the lump. Mammography can detect breast lumps that cannot be touched by a doctor, and it can also provide early detection and diagnosis of clinical clinic-negative breast cancer with a few tiny calcifications as the only manifestation. The incidence of breast cancer in China is the first of female malignant tumors. Early diagnosis is especially important for the survival of breast cancer patients. Therefore, it is recommended that women over 40 years of age should undergo regular outpatient breast examination and breast cancer screening, especially for women between the ages of 40 and 50, once a year.