Diarrhea after running may be the lack of exercise on weekdays, or too much tension and the abdomen is cold and other reasons can lead to diarrhea. 1. Lack of exercise: the patient’s daily exercise is less, suddenly after running, the abdominal muscles are tense, resulting in gastrointestinal spasm, there will be diarrhea after running, it is recommended that the patient’s daily appropriate running, do not suddenly carry out a large number of sports. 2. Too much tension: after a lot of running, the heart rate rises, the mental condition is more tense, often easy to cause gastrointestinal dysfunction, at this time there will be diarrhea, after resting for a few hours can be improved. 3. Abdominal cold: because the morning and evening air is cooler, if you do not pay attention to abdominal warmth, cold, will lead to abdominal cold, gastrointestinal tract peristalsis increase, there will be diarrhea. Diarrhea after running may also be caused by other reasons, it is recommended that patients go to the hospital as soon as possible to identify the cause of the disease, under the guidance of the doctor for targeted treatment.