Diarrhea after eating ice watermelon can be treated with dietary adjustments, localized hot compresses, oral medications, and rehydration therapy to treat the disease as well as relieve the discomfort. 1. Adjust the diet: after eating ice watermelon, due to the gastrointestinal mucosa is stimulated by cool substances, peristalsis is too fast, there may be diarrhea symptoms. You can first adjust the diet, drink some warm water or eat some porridge and soup food, such as millet porridge, yam porridge, etc., to reduce gastrointestinal stimulation, relieve diarrhea symptoms. 2. Local hot compresses: you can use a warm towel to apply hot compresses to the abdomen to reduce the spasm of the gastrointestinal tract due to cold, slow down the gastrointestinal peristalsis, and relieve the symptoms of diarrhea. 3. Oral medication: You can take some anti-diarrhea medication, such as montelukast to relieve diarrhea symptoms. Diarrhea may lead to intestinal flora imbalance, you can also supplement probiotic preparations, such as Bacillus subtilis, lactobacillus to regulate the intestinal flora environment, reduce diarrhea. Combined with enteritis, oral antibiotics for anti-infection treatment, such as ceftazidime, ciprofloxacin and so on. 4. Rehydration therapy: If the diarrhea is more serious, rehydration therapy should be carried out to prevent dehydration and electrolyte disorders. Such as oral rehydration salts, severe symptoms need intravenous drip sodium chloride injection, grape injection, etc. for fluid replacement. The above drugs should be used under the guidance of clinicians to avoid adverse reactions.