Malignant tumors are currently the diseases with the highest death rate in China, among which gastrointestinal tumors account for about 50% of malignant tumors. Common GI malignant tumors include esophageal cancer, gastric cancer, colorectal cancer, liver cancer and pancreatic cancer, among which gastric cancer and liver cancer have a high incidence in China, while pancreatic cancer and colorectal cancer have been gradually increasing in recent years. Modern medical research has found that if GI tumors can be detected early, the cure rate can be greatly improved and the mortality rate reduced. However, most of the domestic GI tumors are already in late stage when diagnosed, which leads to loss of opportunity for treatment, causing great loss to families and individuals and seriously affecting people’s health. If early detection and early treatment are possible, it is crucial to improve patients’ quality of life and prolong their lives. However, GI tumors often do not have special symptoms in early stage, or the symptoms are mild, which often do not attract attention and delay the time of early treatment. Therefore, early detection is very important for digestive tract tumors. Popularizing medical science knowledge and understanding the early signs of GI tumors are of great significance for early examination and detection. What are the early signs of early GI tumors? Generally speaking, the main signs are changes of digestive function, which are not too obvious, sometimes with and sometimes without, so they are easily ignored. These manifestations include: 1. loss of appetite, indigestion, lack of appetite for food, and less meal quantity than before. 2. 2. Abdominal distension and abdominal discomfort. Early stage tumors do not show obvious abdominal pain, but often show bloating and abdominal discomfort. 3. Frequent diarrhea or constipation, change of stool color, sometimes darkening or tar-like stool, sometimes with fresh blood. 4.Feeling of poor feeding and obstruction, especially after eating hard food. 5.Unexplained obvious weight loss, due to changes in digestive function will cause a reduction in eating, in a very short period of time, there is a significant weight loss. 6.Feeling weak, tired, short of breath, especially in the elderly. This is the symptom of anemia caused by low nutrient absorption and long-term chronic blood loss in the digestive tract. These are the early signs of digestive tract tumor. When these signs are present, it is best to go to the hospital for relevant examinations to understand the specific situation. So what are the tests that need to be done? 1. Blood routine and fecal occult blood examination. If there is anemia, the cause of anemia should be traced, instead of treating anemia in a sloppy manner first. If the fecal occult blood is positive, it means there is bleeding in the digestive tract, so we should continue to investigate the cause of bleeding, especially for the elderly, and should not be taken lightly. 2. Tumor marker examination. Some digestive tract tumors can show positive for certain tumor markers in early stage, suggesting the possibility of digestive tract tumor, which needs to be investigated. 3.Gastrointestinal tract imaging to understand the condition of digestive tract, including upper gastrointestinal tract imaging and lower gastrointestinal tract imaging. It needs to be selected for examination under the guidance of doctors. 4.Electron gastroscopy and colonoscopy. These examinations can directly observe changes in the mucosa of the esophagus, stomach, colon and rectum, and find suspicious lesions, and also biopsy pathological examination can be performed to make a clear diagnosis. Therefore, early detection and early treatment are necessary so that there is a chance to eradicate the tumor and kill the disease in the cradle. So what causes the occurrence of malignant tumors? There are many factors involved in the occurrence of tumors, and modern medicine has found that there are various physical and chemical factors, biological factors as well as psychological factors. The development of digestive tract tumor is caused by the joint action of these factors and long-term influence. It is important to develop good habits in life to get twice the result with half the effort. These habits include: 1. Changing bad eating habits: eliminating factors that may diet esophageal cancer and stomach cancer. Such as not eating cold and rough food, not eating too hard, too hot and too spicy food. The speed of eating should not be too fast, but chew and swallow slowly. Eating should be regular and quantitative, and avoid having a full meal. 2, avoid smoking and alcohol. “Smoking is bad for health” everyone knows. But most people believe that smoking can lead to lung cancer. In recent years, it has been found that smoking is also closely related to the occurrence of oral cancer, esophageal cancer and stomach cancer. Alcohol has a direct irritating and damaging effect on the esophagogastric mucosa and should not be ignored. Do not “have a drink today” “give up your life with the gentleman” “good man spirit” and “straight personality”. 3, improve food processing methods. Avoid eating foods with high nitrosamines content, try to eat less pickles, salted fish, cured meats, ham, sausage and other pickled, fumigated, fried food, because the production process of these foods will produce nitrosamines and polycyclic aromatic hydrocarbons and other carcinogenic substances. Do not eat moldy and rotten food, and eat more fresh vegetables and fruits. 4.Regularly review and treat related precancerous diseases. Such as oral diseases, esophagitis, esophageal white spots, gastric ulcer, atrophic gastritis, epithelial hyperplasia of gastric mucosa, gastric polyps, etc. Once polyps are diagnosed, it is best to treat them with minimally invasive surgery to avoid future problems. 5.Improve the diet structure. The nutritional composition of various foods is different, and the diversification of food and rationalization of nutritional structure are beneficial to the prevention of tumor. Foods with preventive effect on tumor include: (1) melon, bitter melon, pumpkin, kiwi, fig, walnut, papaya, peach kernel, rooibos, etc. (2) vegetables: garlic, onion, olives, carrots, tomatoes, cilantro, asparagus, kelp, nori, etc. (3) edible mushrooms: shiitake mushrooms, mushrooms, flat mushrooms, wood ear, monkey head mushrooms, etc. (4) Grains: mung beans, soybeans, buckwheat, sorghum, oat, barley, etc. (5) Animals: turtle, snapper, loach, oyster, sea cucumber, snail, etc. (6) Other: pollen, honey, vinegar, chrysanthemum, green tea, etc. 6, maintain optimism and open-mindedness, positive emotions. Once the problem is found, pay attention to it, but do not “worry about the sky” “fearful not to end the day”. That will not help, but because of too much anxiety and depression, leading to gastrointestinal dysfunction, the disease will come. Gastrointestinal tumor is not a terrible disease, it can be effectively prevented by good habits in daily life, and when early signs appear, you should go to hospital for detailed examination and treatment.