Question: what does it mean when everything you eat upsets your stomach?
Answer: Upset stomach is usually a mild problem that goes away on its own. But sometimes it can be a sign of a medical issue, such as GERD (gastroesophageal reflux disease), ulcers, lactose intolerance, irritable bowel syndrome, an intestinal infection, and some types of cancer. Upset stomach can also be a sign of pregnancy.