Diarrhea before the examination, must pay attention to the number of diarrhea, a day if the case of diarrhea 4-5 times, no accompanying other symptoms, no nausea, vomiting, abdominal pain and other manifestations, you can promptly take montelukast and rectify intestinal raw symptomatic treatment. When diarrhea occurs before the examination, many of them are related to stress and manifest as the manifestation of irritable bowel syndrome. For this type of patients, it is important to psychological counseling, relaxation, and correct treatment of the examination in order to treat the patient with diarrhea at all. If there are repeated manifestations of pre-exam diarrhea, nausea, vomiting and abdominal pain, it is important to improve the electronic gastroscopy in a timely manner.