The pain of a colonoscopy without anesthesia is generally within tolerable limits, but everyone’s tolerance for pain is different. During the examination, the doctor inserts a camera-equipped instrument through the anus into the patient’s intestines and slowly pushes it in and inflates the intestines in order to stretch the intestinal muscles. This operation, together with the patient’s mental and emotional state, as well as the individual’s sensitivity to pain, will inevitably result in a painful colonoscopy. Try to relax as much as possible to avoid prolonged bowel cramps, but inform your doctor if the pain is severe. Colonoscopy is mostly used for rectal and colorectal cancers and polyps, but it is not suitable for people with more serious heart diseases, pregnant women, psychiatric patients, and people who have had multiple abdominal surgeries. The test should be done under the guidance of a doctor. Bowel preparation is usually done routinely before the colonoscopy. After the examination, the patient should rest in bed for three days and should not do strenuous exercise or physical labor for 15 days. If you are preparing for colonoscopy, it is recommended that you first actively seek medical attention and listen to your doctor’s professional opinion as to whether you need to undergo the test. If the patient really needs to have the test and is concerned about pain, it is recommended to consult a specialist for information about colonoscopy under anesthesia.