Eating too much watermelon may cause diarrhea. Watermelon is a cool food, and eating a lot of it may lead to an abnormal increase in gastrointestinal motility, which may cause diarrhea. If you eat iced watermelon, the lower temperature may also irritate the gastrointestinal tract and cause diarrhea. In addition, eating spoiled, stored in the refrigerator for a long time of watermelon can cause acute gastroenteritis occurs, will also lead to diarrhea. Therefore, eating too much watermelon is very likely to lead to diarrhea, if you eat watermelon after diarrhea and the symptoms continue to not get better, it is recommended to go to the hospital, improve the relevant examination or symptomatic treatment.