Children can contact cancer patients, cancer is not contagious, but contact with the following types of cancer patients should still be careful, because these types of cancers are related to bacterial or viral infections: 1. Stomach cancer, the development of stomach cancer is related to Helicobacter pylori, and Helicobacter pylori can be transmitted to others. 2. Liver cancer, if a person’s liver cancer is caused by viral hepatitis, contact should be prevented from being infected with hepatitis. 3, Nasopharyngeal cancer, human herpes virus type 4 is closely related to the development of nasopharyngeal cancer, so it is necessary to prevent being infected with the virus when in contact.