1. Lung:Lung cancer is at the top of the list for both men and women. There are two main reasons, the first is smoking. The second is environmental pollution. 2.Breast:Breast cancer is the most common cancer among women. The main factors are: eating high-fat and high-calorie food, mental stress, late marriage and late childbearing. 3. Stomach:Besides salt, salt-pickled food, red pepper, processed meat, smoked food, barbecued animal food, etc., which are the causes of stomach cancer, the change of gastric mucous membrane as well as atrophic gastritis can also lead to the occurrence of stomach cancer. In addition, “sharing meals” will also increase the chance of spreading Helicobacter pylori, the direct cause of stomach cancer. Therefore, some people even categorize stomach cancer as an infectious disease. 4. Liver: Current evidence shows that hepatitis B virus, consumption of aflatoxin-contaminated cereals and beans, and long-term alcohol consumption are the direct causes of liver cancer. 5.Esophagus:The main reason leading to the occurrence of esophageal cancer is liking to eat hot food, such as drinking hot tea frequently. In addition, smoking, obesity, consumption of processed meat and other factors are direct triggers. Gastric acid reflux is also a risk factor for increasing esophageal cancer. 6.Colon:Red meat, drinking a lot of alcohol, high-temperature fried food, and holding back the bowel movement are all possible causes of colon cancer. 7.Bladder: Arsenic in drinking water is one of the causes of bladder cancer. In addition, holding urine often can also increase the risk of bladder cancer. 8, pancreas: pancreatic cancer is a representative of “rich disease” in cancer, obesity and diabetes can lead to this disease. 9, lymph: lymphatic and hematopoietic system cancers mainly include lymphoma, leukemia and multiple myeloma. Environmental pollution, viral infection and obesity are the causes of lymphoma. 10, kidney: body obesity, arsenic content in drinking water and smoking are three factors that can lead to kidney cancer. 11, Cervical and Ovarian Cancer: The causes of cervical and ovarian cancer are manifold, such as endocrine disorders caused by staying up too late, starting sex life too early, and so on.