Watermelon eaten diarrhea may be normal physiological reasons, may also be gastroenteritis, indigestion, irritable bowel syndrome and other pathological factors. 1. Physiological factors: if you eat too much watermelon, too cold or too fast, etc., will produce stimulation of the gastrointestinal tract, so that the gastrointestinal peristalsis accelerated, resulting in diarrhea, which is generally a normal physiological phenomenon, the patient will not have obvious discomfort. 2. Pathological factors: If the patient himself suffers from gastrointestinal diseases, such as gastroenteritis, dyspepsia, irritable bowel syndrome, gastrointestinal tumors, etc., after consuming watermelon, it may increase the burden on the stomach and intestines, stimulate the gastrointestinal tract, leading to the patient to appear the performance of eating watermelon diarrhea. If the patient has diarrhea after eating watermelon for a long time or repeatedly exists, and accompanied by discomfort, it is recommended to consult a doctor in a timely manner to find out the cause of the disease, and actively accept the treatment, so as not to delay the condition.