A family history of cancer mainly refers to the fact that more than one person in a family has different types of cancer or more than one person in the immediate family has the same type of cancer. Family history of cancer is often due to certain types of gene mutation in the family, which leads to a higher risk of cancer in the family than in normal people, i.e., susceptibility to tumors, but not necessarily to diseases. Therefore, people with a family history of cancer should have regular medical checkups, maintain good living and dietary habits in their daily lives, avoid contact with toxic and radioactive substances, and exercise appropriately in order to prevent the occurrence of cancer. It is recommended to consult a doctor in time if there is any discomfort, and not to treat oneself, but to follow the standardized treatment under the guidance of a doctor’s interview.