Watermelon may cause reddish coloration in stools, which is a normal physiological phenomenon. If the coloration remains red after stopping consumption of watermelon for a few days, prompt medical attention is required. As watermelon contains a lot of carotene, lycopene and other natural red pigments, when a large number of watermelon consumption, watermelon pigments may not be able to timely decomposition, metabolism, will be discharged with the feces, resulting in red stools, which is a normal phenomenon, after stopping the consumption of watermelon for a period of time, the color of the stools will gradually return to normal. However, if you stop eating watermelon for more than 3 days and your stools are still red, you need to go to the hospital in time to see if there are red blood cells in your stools, i.e. gastrointestinal bleeding. When the stool is abnormally red for a long period of time, it is recommended to consult a doctor in time for targeted treatment under the guidance of the doctor.