In recent years, almost everyone is surrounded by relatives or friends who are suffering from “cancer”, as if “cancer” is not far from them, and they are afraid of hearing “cancer”. Due to the influence of diet, environment, life or occupation, gastrointestinal tumors are also on the rise, and many patients have delayed the best treatment time because of untimely examination. The following symptoms and signs often appear and need to be checked regularly or should be highly concerned. 1.Patients with stomach disease should have early and regular gastroscopy to exclude stomach cancer. 2.When you are over 45 years old and have recent indigestion symptoms, or have symptoms such as wasting, anemia, vomiting blood, black feces, difficulty in swallowing, abdominal lumps, jaundice, or progressive aggravation of indigestion symptoms, you should go to hospital for examination to determine the actual condition. 3. Those who have recurrent blood in stool, mucus stool, black stool and loose stool should pay attention to colonoscopy. With the younger onset of tumor, even if the manifestation is bleeding hemorrhoids, in order to avoid misdiagnosis and mistreatment, colonoscopy should be performed. 4.For those who are above 40 years old and have the following high-risk factors: colorectal adenoma, family history such as colorectal polyp syndrome or family hereditary non-polyp colorectal cancer or first-degree blood relatives with colorectal cancer, ulcerative colitis, etc., long-term follow-up should be conducted and regular colonoscopy can be performed. 5.After 40 years old, gastroscopy can be used as a daily physical examination item, and attention should be paid to exclude pancreatic cancer, especially for those with family history of gastrointestinal malignancy, regular routine examination should be performed.