###Human: I get loose motion and stomach upset whenever I eat watermelon. Why does this happen? ###Assistant: Hello. You seem to have allergy to some food products. You should do an allergy sensitivity test for food products and fruits. This test will tell you which food and fruits you are allergic to and you should avoid having those foods. What is your age? Did you have any fever or rash on your body? For now, try tablet Levocet (Levocetirizine) twice a day for 5 days. Also, take tablet Loperamide 2 mg twice a day for 5 days. Take care.