Certain meals upset my tummy, i don't know why and how it happens. i need answers because it makes me loose weight most atimes, what should i do?

Anything: Most people think their whole abdomen is their stomach, but the stomach is in the upper middle or upper left of the abdomen. If your lower abdomen hurts, that could be your skin, muscles, bladder, uterus, or intestines. If the upper part of your abdomen hurts, it could be acid reflux, pancreatitis, or other problems. See a doctor for an assessment.

Food allergies?: Keep a food diary and see if you can pinpoint exactly which foods are contributing to the problem. Eliminate such foods one at a time for at least three weeks and see if problem persists. If problem goes away, add food back to see if it returns. If it does, you know the problem. Start with lactose and gluten products. If this doesn't work, see a gastroenterologist.