The stomach pain caused by eating watermelon is because watermelon is a cold food, after using it will produce cold stimulation to the gastrointestinal tract, causing spasmodic pain, and even bloating and diarrhea. The quickest solutions are: 1. immediately stop eating watermelon to prevent further aggravation of abdominal pain, do not drink cold water, do not drink cold drinks. 2. use drugs that regulate for intestinal flora, such as Bifidobacterium tetrasporium tablets, which can regulate the balance of intestinal flora. 3. take oral drugs that help digestion and promote gastrointestinal peristalsis, such as stomachic and digestive tablets, Mosapride citrate tablets, which can promote digestion and excretion and reduce the symptoms of abdominal pain and bloating. 4. 4, the application of antispasmodic and analgesic drugs, diarrhea at the same time the application of antidiarrheal drugs, such as scopolamine, atropine, can effectively relieve intestinal spasm caused by the pain stimulation, oral montelukast can effectively relieve the symptoms of diarrhea.