I. Polymasthenia: Polymasthenia, also known as paramasthenia, is more common. The disease occurs outside the normal breast, mostly in the upper part of the normal breast near the axilla or in the axilla. Parammary glands can change with pregnancy, menstruation, and other symptoms such as swelling, pain, and even lactation. Parammary glands can also have multiple nipple deformities at the same time. Most of them do not require treatment, but cancer can occur in the paramammary glands, and they can be surgically removed if they become diseased or affect the body shape. The most important thing is to correct the deformity. The corrective surgery cannot solve the breastfeeding problem, but only the infection and aesthetic problems. Mammary hyperplasia: Mammary hyperplasia is a benign disease rather than cancer, which is caused by the increase of estrogen level in the body, resulting in the proliferation of glandular end ducts and alveoli and surrounding fibrous tissue in the breast tissue, accompanied by lymphocytic infiltration. Mastocytosis is divided into three types: (1) breast pain: also known as breast tissue hyperplasia, characterized by periodic pain in the breast, mostly seen in women aged 20-40, with pain related to the menstrual cycle, with obvious symptoms before menstruation and relief after menstruation. The correct method of examination breast can not feel the lump, most of them show local tissue thickening and diffuse distribution of granular areas, so it is also called swollen granular breast. Breast pain is mostly self-limiting, can be relieved after marriage and pregnancy, and does not become cancerous. (2) Breast adenopathy: Mostly seen in young and middle-aged women, it is often a limited lump with pain in one breast, or bilateral, and the pain is related to the menstrual cycle. The lump is small, about l-3 cm in diameter, firm and not hard, with poorly defined boundaries with the surrounding tissue. The early stage of mammary gland adenopathy is lobular hyperplasia with cobblestone sign. This fashion is not cancerous, but there is a 1% cancer rate in the middle and late stages of mammary adenopathy. (3) Cystic hyperplasia of the breast: it is common in middle-aged women and manifests as a breast lump, but a single larger lump, round and spherical, with a smooth surface, cystic or solid feeling. It can also be manifested as multiple cystic nodules in the breast. About one-third of patients may have pain and tenderness in the early stage, but it is not significant, and sometimes there is nipple discharge. About 3-7% of cystic hyperplasia of the breast can become cancerous, so it is necessary to be especially vigilant and visit the doctor regularly. Cysts in the breast: The accumulation of milk in the breast to form cysts, mostly in young women, usually occurs during breastfeeding and after the cessation of breastfeeding, patients often go to the doctor with breast lumps, slight swelling and pain, the lumps are clearly bounded, smooth and cystic, ultrasound examination can confirm the diagnosis. The cyst can be reduced after the lactic fluid is extracted by puncture, but if it is full again after puncture, surgery is required. V. Intraductal papilloma: The main manifestation is nipple overflow, mostly bloody or yellow plasma overflow, which can be diagnosed by endoscopy or ductography. Fibroadenoma of the breast: Common in young women, its occurrence is related to estrogen. Single or multiple lumps appear in the breast, round or oval, with smooth surface, clear border, tough texture and slippery feeling. Patients over 25 years of age or tumors larger than 2 cm should be treated with surgical excision. Breast cancer: Breast cancer is one of the most common cancers in women and its incidence is on the rise. Women with high risk factors for breast cancer have a higher chance of developing breast cancer, mostly seen in women aged 35-55. Women should go for regular medical checkups in their daily life and always pay attention to their body for any signs of mastitis disease, and if they have some reactions they should find out what is the cause of the discomfort. To confirm whether it is a breast disease, you need to go to the hospital for a specific examination.