Breast enlargement is one of the most common benign diseases in adult women. Many women worry about breast cancer when they have a hard lump in their breast, and they worry about cancer as soon as they are diagnosed with breast enlargement. Therefore, they are very afraid of breast enlargement and worry about cancer. In fact, breast hyperplasia is a common disease among women aged 30-50, which is a disorder of the normal structure of the breast, not inflammation, not cancer, and most of them will not be transformed into cancer. It is because of the lack of understanding of it that many people are overly nervous. 1, what is breast hyperplasia Breast hyperplasia is also called “breast adenopathy”, it is a benign hyperplasia of breast tissue. It is a benign growth of the breast tissue. Therefore, it is neither a tumor nor an inflammatory disease. Fifty percent of women over the age of 30 have breast enlargement to varying degrees. Breast hyperplasia is caused by a disturbance in the endocrine function of the ovaries, i.e., a decrease in luteinizing hormone and an increase in estrogen. Under normal circumstances, women also have cyclic hyperplasia of the breast tissue, but with the cyclic adjustment of hormones, the breast tissue will revert. However, some women with endocrine disorders have incomplete breast rejuvenation, so their breasts feel lumpy to the touch and are accompanied by swelling and pain before menstruation, which is alleviated after menstruation. We emphasize that breast hyperplasia occurs mostly in the age of 30-50 years, to distinguish it from physiological hyperplasia in adolescents and during pregnancy and breastfeeding. In adolescent girls, the mammary glands begin to develop, and even if they feel slightly swollen and painful, this is normal; during lactation and pregnancy, the mammary glands have to prepare for feeding the baby, and hyperplasia is also normal. After menopause, because the overall level of endocrine decline, especially estrogen began to reduce, breast hyperplasia is rare, and then there are breast lumps, you need to exclude the possibility of tumor. 2, will breast hyperplasia become cancerous? Histologically, breast hyperplasia is divided into many kinds, and the possibility of cancer varies. The most common one is simple lobular hyperplasia, which accounts for 70% of all breast hyperplasia, and this kind of hyperplasia will not be cancerous; ductal epithelial hyperplasia without cellular anomalies accounts for 20% of patients, and only 1%-2% of them are cancerous; ductal epithelial hyperplasia with cellular anomalies accounts for 10% of patients, and 2%-4% of them are cancerous, and 2%-4% of the ones with severe cellular anomalies will be cancerous, and 2%-4% of those with severe cellular anomalies will be cancerous, and 2%-4% of them will be cancerous. In the case of ductal epithelial hyperplasia with cellular anomalies, 10% of the patients, 2%-4% of the patients with mild cellular anomalies will be cancerous, and 75%-100% of the patients with severe anomalies will be cancerous. As we can see from the above, more than 90% of breast hyperplasia is safe and will not become cancerous, so patients only need to check themselves and go to the hospital for review on a regular basis. 3.How to identify hyperplasia and tumor According to statistics, the incidence rate of breast cancer in China is more than 50 per 100,000, and there is a rising trend in recent years. Women with breast hyperplasia, especially those with a family history of cancer, early menarche, late menopause, late childbearing, infertility and non-lactation, should pay attention to hyperplasia and tumor identification. It is not difficult to differentiate between the two. Breast hyperplasia usually develops bilaterally at the same time and is felt as a painful swelling associated with the menstrual cycle. The border of the lump is not clear to the touch, or bead-like changes, the texture is not very hard, and there is no adhesion with the skin. This is not the case with breast cancer, where patients are often initially asymptomatic. The first common symptom is the discovery of a lump that is clearly distinguishable from the surrounding breast tissue, and more than 80% of them are felt by the patients themselves. The location of the lump is variable, but it is more likely to be in the upper outer region of the breast. If a firm, thickened area or lump that is distinctly different from the surrounding tissue is palpated in one breast but not the other, be alert to the possibility of cancer. Breast cancer often begins as a painless lump, even though some patients are in pain, mostly with breast enlargement. The tumor usually occurs in one breast, but it can also develop bilaterally. The lumps have distinct borders, are adherent to the skin, and sometimes have nipple inversion, which manifests as orange peel-like skin changes or even ulcers. Pushing the lump with the finger, it can move freely under the skin at the beginning, and with further development, the lump can be adhered to the chest wall and cannot move. At this time, the patient must go to the hospital for examination in order to accurately diagnose and timely treatment. Current auxiliary diagnostic methods include ultrasound, molybdenum target photography, etc., while infrared examination is not very accurate, so it is not recommended. If it is still difficult to confirm the diagnosis, biopsy can be performed.