Why am I in pain? Heartburn is as American as apple pie—more than 60 million people experience it at least once a month. For some people—those with gastroesophageal reflux disease, or GERD—heartburn can be a constant companion. Some heartburn triggers are obvious: chili dogs, chocolate cake, Thanksgiving. But heartburn doesn’t stop and start with food alone. If you have constant heartburn, it's time to track down the real culprit.