Intestinal tumors have a certain genetic susceptibility, that is, people with a family history of intestinal tumors are more likely to develop intestinal tumors than ordinary people, and it cannot be said that intestinal tumors are inherited in families. The etiology of intestinal tumors is still unclear, and family history is a high-risk factor for its development. If there are patients with intestinal tumors among first-degree relatives (parents, children, siblings), high risk of intestinal tumors should be considered. Some familial hereditary diseases, such as familial intestinal polyposis, have been shown to be precancerous lesions, which can progressively proliferate, mutate into adenomas, and ultimately mutate into cancers. 70% of colon cancers evolve from this. If there is a family history of intestinal tumors, it is recommended to undergo colonoscopy at the age of 40 even if there are no clinical symptoms. Regular monitoring can regularly screen intestinal tumors and deal with pre-cancerous lesions at an early stage, so as to achieve early detection, early diagnosis and early treatment.