Pre-cancerous lesions are benign. The so-called pre-cancerous lesions refer to a number of benign lesions that have the potential to turn into cancer in the future, but not necessarily turn into cancer. At present, common pre-cancerous lesions in clinical practice include familial colorectal polyposis, colorectal choriocapillaris adenoma, leukoplakia, chronic atrophic gastritis with intestinal epithelial chemotaxis, and giant chronic gastric ulcer, etc. In addition, epithelial atypia of organs is also considered as pre-cancerous lesions. In addition epithelial atypia of organs are also considered precancerous, such as cervicitis with severe atypia, hyperemesis gravidarum with significant proliferation of trophoblast cells, and severe atypia of the endometrium. Pre-cancerous lesions are benign lesions, which usually do not need special treatment, but only need close follow-up, and should be treated in time once cancerous tendency occurs, and some pre-cancerous lesions need to be treated by surgery, and do not need to be treated with any anti-tumor treatments, such as radiotherapy and chemotherapy, after the surgery.