The colonoscopy itself usually takes about 15-20 minutes. Two days before the colonoscopy, patients should try to choose liquid, low residue type of food, and avoid intake of high fiber, high fat and other substances. And 12 hours before the examination, you need to take an appropriate amount of laxative medicine to better achieve the purpose of cleaning the intestinal contents and ensure the smooth conduct of the examination program. During the colonoscopy, an endoscope is inserted into the rectum by the medical staff. A miniature camera at the tip of the tube provides a view of the internal structure of the entire intestinal tissue. If necessary, tissue samples of polyps or other types of abnormal tissue inside the intestine are taken and biopsies are performed to make a definitive diagnosis of the type of disease and pathological staging. This procedure takes about 15-20 minutes. After the patient has undergone the bowel examination, he or she needs to stay in the recovery room for about 30 minutes for observation. Patients may feel adverse symptomatic reactions such as abdominal pain and bloating a few hours after receiving a colonoscopy. Moderate walking activities at this time can help relieve discomfort such as bloating and stuffiness. If patients show symptoms such as persistent abdominal pain, fever, or bloody stools, they need to be rechecked promptly to avoid adverse consequences.