Acid reflux can cause pain and burning just by the simple act of eating. If you have acid reflux, certain foods can trigger an episode of acid reflux. Although everyone has different triggers, some people experience acid reflux after eating fruit. Acid reflux, also known as heartburn, occurs when the stomach produces excess acid to digest the food just eaten. Combine the excess acid with a sphincter muscle that doesn't close properly and you have acid reflux. The weakened muscle allows some acid to leak, causing the acid to flow back up the esophagus. This backward flow of acid causes the pain and burning experienced by acid reflux patients. Acid reflux is a symptom of GERD (gastric esophageal reflux disease) which is more serious. Some GERD patients need to have surgery to repair the sphincter muscle. Frequent acid reflux can also irritate the esophagus and cause bleeding in some people.