Lobular hyperplasia In daily life, people often refer to benign lumps in the breast as lobular hyperplasia of the breast, but this designation is not scientific. Lobular hyperplasia is just a pathological change in the early stage of breast hyperplasia. With the increase of estrogen before menstruation, interstitial edema can occur, and the lobules increase, causing breast swelling and even nodules, so it is called lobular hyperplasia. After the onset of menstruation, with the decline of estrogen, the above reaction subsides, these are physiological reactions. These are physiological reactions and generally do not require special treatment. Cystic hyperplasia Cystic hyperplasia follows lobular hyperplasia when the breast tissue shows ductal expansion or even cystic expansion, so it is called cystic hyperplasia or cystic disease. Cystic hyperplasia is characterized by mild swelling and pain in the breasts, but the lumps are more obvious and increase significantly a few days before menstruation, accompanied by pain, and after menstruation, the lumps shrink and the pain disappears, showing cyclical changes. Generally, no treatment is needed. If the pain is severe, the method of warming Yang and tonifying the kidney can be used in the first half of menstruation to promote luteinization, while in the second half of menstruation, the use of this kind of drugs is stopped and the treatment of liver and qi is used instead. Breast fibroadenoma Breast hyperplasia can be accompanied by fibrous hyperplasia in the late stage, forming breast fibroadenoma, which is a benign tumor, mostly occurring in 20~25 years old women, ovoid in shape, with smooth surface, hard texture and clear boundary, and it is usually diagnosed by ultrasound. Fibroadenomas are the most common benign tumors of the breast and generally do not require surgical removal. Surgical removal is preferred during pre-pregnancy or while taking estrogen. Pre-cancerous lesions Pre-cancerous lesions are abnormal proliferation of breast epithelial cells to a certain degree in morphology, and some of them may develop into breast cancer after follow-up. 2003 World Health Organization (WHO) Breast Pathology in the catalog of the major classifications, the first one is invasive carcinoma, followed closely by pre-cancerous lesions. There are four categories of precancerous lesions: lobular tumors, intraductal hyperplastic lesions, microinvasive ductal carcinomas, and intraductal papillary tumors.