Lung cancer is one of the most deadly malignant tumors in the world today, and 85% of the patients are related to smoking. Lung cancer is a disease caused by “gas”, focus on preventing “five gases”! These “five gases” are: tobacco smoke pollution, outdoor air pollution, kitchen fumes pollution, decoration materials pollution, and often sulking. Stomach cancer prevention – avoid spicy and salty: stomach cancer is mainly “eaten out”, especially excessive spicy food and excessive salt are very harmful to the stomach. Too much salt will damage the gastric mucosa and make the cells on the stomach wall atrophy. Processed meat products and pickled foods contain more salt, the production process will also produce a lot of nitrite, too much intake will cause damage to the stomach and intestines, and even induce precancerous lesions. In addition, spicy food will stimulate and destroy the mucous membrane of gastrointestinal tract, which will cause cancerous changes of stomach cells if repeatedly stimulated for a long time. Prevention of liver cancer – “four not to eat”: to prevent liver cancer, we should pay attention to the following in daily diet: do not eat moldy food; do not eat or less pickled vegetables; do not drink alcohol or less alcohol; animal and vegetable oils should not be consumed after they have deteriorated. Esophageal cancer prevention – don’t “eat while it’s hot”: Esophageal cancer is mainly caused by some eating habits, such as “eating while it’s hot”. Although “eating and drinking while it is hot” is comfortable for a while, the excessive temperature will cause burns to the esophageal mucosa, and repeated stimulation in the long run will cause degeneration of esophageal mucosal epithelial cells or cause breakage and ulceration, which will induce cancer. Colorectal cancer prevention – “one minus, two plus”: the first thing to do to prevent intestinal cancer is to reduce the intake of double-high (high animal protein, high fat) food. Research shows that long-term consumption of high-fat, high-protein and low-fiber foods is one of the causes of colon cancer. Two plus, i.e. increase fruits and vegetables roughage and exercise, more than 30 minutes of exercise three times a week. Prevention of pancreatic cancer – less sweets: pancreatic cancer is a lifestyle disease, excessive intake of high-fat diet, insufficient intake of dietary fiber, and reduced physical activity are all related to the disease. Excessive intake of sweets can increase the risk of pancreatic cancer. Breast cancer prevention – remember the “3 1’s”: 1 specialist examination once a year, 1 self-examination once a month and 1 breast cleaning once a day. Prevention of brain cancer – stay away from electronic radiation: Although there is no evidence that cell phone radiation can directly cause brain cancer, there is a certain overlap between the widespread use of electronic products and the growth trend of brain cancer. Leukemia prevention – less hair dyeing: Leukemia, commonly known as “blood cancer”, is one of the ten most prevalent malignant tumors in China. Cancer-causing factors include excessive exposure to organic solvent dyes, most commonly hair dyes and perms, or living or working in newly renovated houses with a large amount of toxic and harmful chemicals. Prevention of lymphoma – learning to reduce stress: The onset of lymphoma has a lot to do with human immune function. If a person works under excessive pressure for a long time, which leads to mental tension, psychological stress and irregular life and rest, making a person very tired and causing the human body’s resistance to decline, lymphoma will be induced. In addition, defective immune function is also a common reason for the occurrence of lymphoma. If the immune system of human body is impaired, it will easily lead to viral infection, which in turn will trigger lymphoma.