It is perfectly acceptable to have a bowel movement on the morning of the physical examination. It is understandable that some people may be a little overly nervous about the physical exam. You need to bring your ID card and make some other preparations, such as not drinking alcohol, not eating high-fat, high-purine foods, and not exercising vigorously to avoid affecting the results of the test a few days before the test. The morning of the physical examination is allowed to defecate, and some people may feel particularly thirsty, you can drink a little water, about 200ml of water will not affect the blood glucose and blood lipids of the physical examination. In addition, if there is a barium meal examination of the upper gastrointestinal tract, gastroscopy, is absolutely not to drink water. If you have a colonoscopy, you must empty your bowels and drink a laxative on the morning of the physical examination to empty all the contents of your intestines.