Is cancer daunting to talk about? What is the cause of cancer? How does cancer occur in a good body? This is a question that many people are confused about. Who are the people at high risk? What are these high-risk groups prone to cancer? The first group is people with bad habits: long-term heavy smoking, long-term alcoholism, drug abuse, long-term overwork, serious malnutrition, partial diet, etc. These people are prone to lung cancer, stomach cancer, liver cancer and other malignant tumors. The second category, occupational factors: people who work in an environment with a lot of dust, such as asbestos factories and coal plants, are prone to lung cancer. The third category is family history of malignant tumors (including the history of immediate or collateral relatives within three generations who have malignant tumors); people who have more than one immediate family member with malignant tumors, which is determined by the genetic susceptibility of tumors. The fourth category is people who are depressed for a long time, have a stressful life and do not know how to adjust their mood. Some studies show that the psychological condition is closely related to the occurrence of tumors, and these people are prone to various malignant tumors. For example, people who like to eat smoked and pickled food are prone to esophageal cancer and stomach cancer; people who like to drink various drinks are prone to leukemia; people who consume moldy food for a long time are prone to liver cancer. In short, there are many factors that contribute to the high incidence of cancer, such as pollution of living environment (chemical pollution, heavy metal pollution, nuclear pollution, etc.) and special microbial infections (hepatitis B virus, AIDS virus, human papilloma virus, Helicobacter pylori infection, etc.). People who are exposed to cancer-causing factors are all prone to get cancer.