The colonoscopy is fine, generally indicating that there are no organic lesions such as tumors, polyps and ulcers in the intestinal tract, but it has been diarrhea, consider the possibility of functional diarrhea, common causes include poor dietary structure, poor gastrointestinal tract function, mental factors, etc. Common causes and treatments 1, bad diet structure: if each meal diet consists of spicy and stimulating, cold and greasy food, and also smoking and drinking habits, will affect the normal digestive function of the gastrointestinal tract. In addition, with the prevalence of take-out, unclean diet is also one of the causes that can easily lead to diarrhea. You should eat less takeout, mainly light diet, and exercise properly to enhance the digestive function of the gastrointestinal tract. 2, poor gastrointestinal function: such as children, the elderly and other people with poor gastrointestinal function, if the diet is not easy to digest is prone to diarrhea, you can consume some drugs such as gastrointestinal tablets to help digestion, while paying attention to a light diet. You can also do appropriate activities half an hour after lunch to help digestion; 3, mental factors: If the recent mental stress, work pressure, study pressure is relatively large, it may also cause stress reactions in the gastrointestinal tract, triggering the occurrence of diarrhea. This situation requires itself to regulate the mind, do more outdoor exercise, regular diet, after a period of time may be alleviated.