All people at high risk for cancer should have cancer screening. If you are an adult over 45 years old with one of the three major cancer-causing factors, it is time to have a cancer prevention screening once a year. One of the three major cancer-causing factors is the family genetic factor of cancer, that is, people whose mothers or sisters have had breast cancer in their family have a higher risk of breast cancer than those who have no family history. The second factor is medical history: 80% of liver cancer patients have a history of hepatitis B. People with long-term stomach disease are at high risk of stomach cancer. The third is occupational factor: if you are often exposed to radioactive substances or toxic substances in your work, or if your work environment is seriously polluted, you are more likely to develop cancer. In addition, people with long-term bad habits, such as smoking, also belong to the high-risk group of cancer. High-risk group of cancer refers to people who are prone to cancer. They can be classified in terms of age and gender, occupational category, marital and childbearing status, urban and rural distribution, family history and living habits, etc. 1. Age and gender Generally speaking, the risk of cancer incidence tends to increase with age. In terms of the gender of incidence, in general, men have more incidence than women. However, there are differences in their incidence in different age groups.2. Occupational categoryOccupational cancer-causing factors often cause occupational tumors.3. Marital and childbearing statusSome cancer incidence rates are affected by marriage and childbearing status. For example, cervical cancer mostly occurs in women with early marriages and early births, multiple pregnancies and multiple births and unclean and promiscuous sex lives, while the incidence rate of unmarried women is lower.4. Urban and rural distribution Generally speaking, the mortality rate of cancer in urban areas is significantly higher than that in rural areas, which is especially serious in large cities.5. Family history Some cancers are hereditary. One type is hereditary tumor determined by genes, and the other type has no exact causative genes or chromosomes, but has obvious hereditary tendency.6. Poor living habits are also an important factor to induce cancer. For example, people often eat high-fat food, less fruits and vegetables, too refined and too fine diet, not eating coarse grains and cereals, eating more pickled and smoked food, high-temperature fried food and other foods. In addition, frequent smokers are also quite likely to develop cancer.7 Other obese people, long-term mental depression and worry, hepatitis B patients and stomach ulcer patients are also high-risk groups for cancer.