Cancer has a tendency to run in families, and the incidence of cancer in people with a family history of cancer is significantly higher than those without a family history. Among the cancers with high heredity are liver cancer, stomach cancer, breast cancer, colorectal cancer, lung cancer, etc. Therefore, people who have a history of these cancers in their family members are classified as high-risk groups. These people should undergo regular checkups because most cancers have no obvious symptoms and manifestations in the early stage, so it is very important for high-risk people to undergo regular medical checkups and cancer screening. Early detection and early treatment of cancer can lead to clinical cure. If the cancer is already in the middle or late stage when it is diagnosed, it cannot be cured clinically and the survival period is relatively short.