Tumors have a certain genetic predisposition. The vast majority of malignant tumors are caused by various factors, and only some relatively rare tumors are hereditary. Usually hereditary does not mean that tumors are directly inherited from parents to children and grandchildren, but the inheritance of disease-causing factors with susceptibility and predisposition, and generally people with family history of tumors have greater possibilities of developing into tumors than ordinary people. Although tumors can be caused by genetic factors, they are also closely related to daily living habits, environment, bacterial and viral infections, etc. Common tumors that are closely related to these factors are breast cancer, gastric cancer and familial polyposis. People with family history of tumors must have regular checkups and pay attention to their health. Although there is a genetic tendency for tumors, on the whole, tumors caused by genetic factors account for a very low percentage of all causes of tumor occurrence, so there is no need to worry too much if your parents have tumors. Therefore, if your parents have tumors, you don’t need to worry too much. You should avoid contacting harmful substances in your daily life, maintain good living habits and mindset, and pay attention to regular checkups.