While it can be embarrassing at times, burping is a normal bodily function. You swallow air right along with the food and drink you consume. The air builds up in the stomach, but eventually it needs to be released. Yet this release of air back up through the esophagus should not be accompanied by food or stomach acid. A number of health conditions could be to blame if this is happening to you, so it's important to get checked out by your physician.