A colonoscopy involves removing all of your pants. Colonoscopy is one of the common invasive tests, which requires emptying the bowel before the examination. During the examination, it is necessary to insert the colonoscope slowly from the anus to the ileum, so as to observe the intestinal mucosa intuitively and accurately. Therefore, during the examination, the patient is required to remove the lower half of the body clothing, so as to facilitate the exposure of the anus and facilitate the operation of colonoscopy. Usually 1~2 days before the colonoscopy to liquid or semi-liquid diet, the day of the examination to maintain a fasting state; try to maintain a relaxed mood during the examination, do not be overly nervous, cooperate with the doctor’s examination, in order to alleviate the discomfort, if necessary, can be considered to carry out painless colonoscopy. Specific examination precautions can be consulted with professional physicians.