Stomach pain after eating fried food or pizza?

"Heartburn" Gastroesophageal reflux disease is a common cause of such symptoms ("heartburn"). If it's in the right side of your abdomen - it can also be due to gallbladder stones/other problems. What happens when you don't eat such foods? If improved, then avoid them. If you are having difficulty swallowing, black tarry stools, weight loss, or noticed any bleeding from your rectum- see a doctor immediately.