Pre-cancerous lesions refer to the difference in the number or shape of cells, which is different from normal cells, but it is not cancer. Once precancerous lesions are detected, it is necessary to change the bad lifestyle, and preventive means can be taken, such as for atrophic gastritis, during the period of intestinal epithelial hyperplasia or low-grade atypical hyperplasia, adopting Chinese medicine and traditional Chinese medicine, and many of them will reverse the intestinal epithelial hyperplasia. For precancerous lesions of the cervix and intraepithelial neoplasia, there are both Western medicine and Chinese medicine methods to do some protective measures in advance. Chinese medicine can also improve the local internal environment by improving one’s immunity, clearing heat and removing toxins, activating blood circulation, and improving blood stasis, all of which can nip pre-cancerous lesions in the bud and prevent cancer from occurring. Surgical treatment is recommended for those who find precancerous lesions are operable.