Gastrointestinal bleeding: colonoscopy is a way to observe whether there is inflammation, tumor and polyp in rectum and colon through colonoscopy. When the patient has symptoms of unexplained lower gastrointestinal bleeding, it is suggested that the patient go to a professional hospital for colonoscopy in time to determine the cause.

Abdominal pain and diarrhea: colonoscopy has a good observation effect on suspicious colorectal diseases caused by abdominal pain and diarrhea, and can judge whether there are lesions. Avoid spicy and irritating foods in the diet, and eat more nutritious foods such as milk and eggs.

A history of colonic lesions, such as polyps, ulcerative colitis and even tumors, requires colonoscopy follow-up and review. Patients with a family history of colon malignant tumor should avoid early canceration, find and treat as soon as possible.