Pain accounts for 30-40% of breast diseases and 90% of outpatient visits (a) Cyclic breast pain Most common in women between 29 and 45 years old, it is often a swelling or dull pain, may involve one or both breasts, and the pain is so severe that it is untouchable and even affects daily life and work. It appears or worsens a few days before menstruation, and then decreases or disappears after menstruation. It mostly occurs in the upper outer quadrant. (II) Non-cyclic breast pain 1. Pain fluctuates due to emotion, diet, sleep and changes. 2, the pain occurs in the lactation period, was swelling pain or throbbing pain, with red, swelling, heat phenomenon, the affected area becomes hard, this is mostly mastitis. 3, caused by benign breast diseases: breast cysts, fibroadenoma, ductal dilatation, trauma, 4, late breast cancer due to the lesion invasion of the nerve, can also appear breast pain. In addition, breast pain can occur during puberty, pregnancy, postpartum and after abortion, which is mostly physiological pain and will disappear on its own without special treatment. Second, breast lumps account for about 60% of breast diseases, 1, both breasts at the same time or successively appeared more than one size of round nodular lumps, no adhesion, mostly for breast cystic hyperplasia; or touch an irregular thickening area, pre-menstrual enlargement, after menstruation shrinkage, to consider the hyperplasia. 2.If the lump is nodular, hard, adherent to the skin, and the border is unclear, it may be breast tuberculosis; 3.Single or 2-3 small lumps in the breast, with clear boundaries, smooth surface, high mobility, no pain, and slow growth, most of them are breast fibroadenoma; especially when the age is below 25 years old. 4, a single lump in the breast, non-adhesion to the nipple skin, no pain, hard texture, unclear boundaries, small mobility, fast-growing, this is the early breast cancer characteristics; continue to develop, combined with nipple inversion, breast skin cellulite changes, and pain, it is more into the late stage. Nipple overflow accounts for 3-8% of breast diseases (a) physiological overflow 1, nipple overflow of colorless transparent liquid, slightly viscous, most common in menopause, menopausal women or patients with mammary hyperplasia 2, milky white liquid, appearing in pregnancy, abortion; 3, a small number of straw-yellow, green and brown Characteristics: double breasts, porous, non-spontaneous (b) pathologic overflow 1, straw-yellow, sticky overflow, most of which is the result of mammary gland Ductal dilatation combined with chronic inflammation; 2. Bloody overflow (bright red, brown, coffee color), mostly seen in intraductal papilloma or papillary carcinoma. Characteristics: single breast, single hole, spontaneous, intermittent.