Mammary gland hyperplasia is a common disease among women aged 30-50 years old. It is a disorder of the normal structure of the breast, not cancer, and most of them do not turn into cancer. Histologically, there are many different types of mammary gland hyperplasia, and the likelihood of cancer varies. The most common type of hyperplasia is simple lobular hyperplasia, which accounts for 70% of all mammary hyperplasia, and this type of hyperplasia will not become cancerous; ductal epithelial hyperplasia without cellular anomalies accounts for 20%, of which only 1%-2% may become cancerous; ductal epithelial hyperplasia with cellular anomalies accounts for 10% of patients, of which 2%-4% with mild cellular anomalies will become cancerous. -Among them, 2% of mild cellular anomalies will become cancerous and 75%-100% of severe anomalies will become cancerous, which should be reviewed in hospital every 3 months. As we can see above, more than 90% of breast enlargement is safe and will not become cancerous, so patients only need to check themselves regularly and go to the hospital for review.