Acute mastitis, an acute purulent disease of the breast, is usually caused by Staphylococcus aureus infection and is most often seen during the lactation period of first-time mothers. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The main reason for this is that it is not easy to get rid of a lump in the breast, and the lump is the main manifestation, the lump is hard, the border is not clear, there is pressure and pain, it can be attached to the skin, the lump does not break, it is not easy to become pus and not easy to dissipate; there is no typical local redness, swelling and pain in the breast, fever, chills, weakness and other systemic symptoms are not obvious. 3, breast fibroids, the most common tumor in the breast, mostly seen in young women, related to excessive estrogen in the body, can occur in one or both breasts, generally solitary. The lump is ovoid or round, smooth surface, medium hard texture, clearly demarcated from the surrounding tissues, no adhesion with the skin, and the lump can be easily pushed. 4.Mastocytosis is a benign disease rather than cancer. It is caused by the increase of estrogen level in the body, which leads to the proliferation of glandular end ducts and alveoli and surrounding fibrous tissue in breast tissue with lymphocyte infiltration. The cause is mainly due to endocrine hormone imbalance. The clinical manifestations are breast pain, breast lumps, nipple overflow, menstrual disorders and other symptoms. 5, polymasthenia, nipple invagination, polymasthenia, also known as paramasthenia, is more common. The disease occurs outside the normal breast, mostly in the normal breast outside the upper near the axilla or in the axilla. Parammary glands can change with pregnancy and menstruation, resulting in swelling, pain, pressure, and even lactation. Parammary glands can also be associated with multiple nipple deformities. Most of these glands do not require treatment, but they can also become cancerous and can be surgically removed if they become diseased or affect the shape of the body. Most of the nipple invaginations are congenital deformities and require surgery to correct them. The corrective surgery is not to solve the breastfeeding problem, but only to solve the infection and aesthetic problems. Breast cysts, also known as lactation, are caused by poor discharge of milk from one lobe during lactation, resulting in the accumulation of milk in the breast, which mainly manifests clinically as swelling in the breast. 7.Breast cancer is the most common malignant tumor in the breast. It is a small, painless lump with hard texture, unsmooth surface and poorly defined tissues that cannot be easily pushed. There are no conscious symptoms in the early stage, and most of them are discovered by patients unintentionally. When the breast cancer lump increases, it will adhere to the skin, and the local skin can be sunken and orange peel-like. When the cancer invades the milk duct, it can make the nipple retract. 8.Cumulative breast cyst, which is formed by the accumulation of milk inside the breast, is mostly found in young women, usually occurs during breastfeeding period or after breastfeeding has stopped, patients often visit the clinic 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. 9, intraductal papilloma, with nipple overflow as the main manifestation, mostly bloody or yellow plasma overflow, can be diagnosed by endoscopy or ductography, and local tumor removal treatment is feasible.