There are many kinds of gastrointestinal tumors, such as gastrointestinal mesenchymal tumor, gastric cancer, colorectal cancer, etc. Early stage of the disease usually has no obvious symptoms, and can be found through physical examination. 1. Gastrointestinal mesenchymal tumor: there are no obvious symptoms in the early stage of the disease, and most of the patients can be found through physical examination by gastroenteroscopy. When the gastrointestinal mesothelioma develops to the middle stage, early satiety, difficulty in swallowing, vomiting blood, blood in stool, abdominal pain, abdominal distension, difficulty in defecation and other symptoms may appear. 2. Gastric cancer: these patients are often asymptomatic or have mild symptoms in the early stage, and may have symptoms similar to gastritis and gastric ulcer, such as loss of appetite, belching (hiccups), acid reflux, nausea, vomiting and so on. 3. Colorectal cancer: patients may have no obvious symptoms in the early stage, with the progress of the disease, diarrhea, constipation, urgency and heaviness (discomfort in the lower abdomen, wanting to relieve stool, feeling of incomplete defecation after defecation), abdominal pain, abdominal mass and so on may occur. The above symptoms alone are not enough to determine the disease, if there is a suspicion of gastrointestinal tumors, it is recommended to consult a doctor in time to find out the cause of the disease and follow the doctor’s instructions for treatment. For people with family history, chronic atrophic gastritis, gastric ulcer, gastrointestinal polyps, chronic colitis, tobacco and alcohol addiction and other high-risk groups of gastrointestinal tumors, they should have regular medical checkups, so as to achieve early detection and early diagnosis and treatment.