If the colonoscopy is normal but the diarrhea is normal, consider the possibility of irritable bowel syndrome, functional diarrhea, etc., and you can give medication and other treatment measures. 1. Irritable bowel syndrome: Irritable bowel syndrome is a kind of functional bowel disease with abdominal pain or abdominal discomfort as the main clinical manifestation, colonoscopy can be no obvious abnormality, accompanied by diarrhea and other changes in bowel habits, you can give montelukast, loperamide and other drugs. 2. Functional diarrhea: functional diarrhea belongs to functional gastrointestinal diseases, which may be caused by gastrointestinal dysfunction or bad mood, etc. Patients with diarrhea symptoms, but enteroscopy and other tests are normal, and no organic lesions are found, can be given bifidobacteria, montelukast and other drugs. If the patient’s diarrhea is more serious, it is recommended to go to the hospital as soon as possible, so as to avoid electrolyte disorders, dehydration and other conditions, and to clarify the cause of the disease for targeted treatment. The above drugs need to be taken under the guidance of a physician, not unauthorized use of drugs.