Acid reflux is a prevalent chronic digestive disorder in which the liquid content of the stomach refluxes into the esophagus. Acid reflux occurs when the sphincter muscle encircling the end of the esophagus does not close properly. The acid from the stomach flows back from the stomach into the esophagus. Some of the symptoms of acid reflux include cough, sore throat, burning or pressure that may come up to the breastbone, and a sour taste in the mouth. Heartburn, on the other hand, is a symptom of acid reflux.
It occurs when the esophagus is irritated. This irritation leads to a burning discomfort in the upper part of the stomach or below the breastbone. Heartburn may not be a consistent symptom of the disorder, and the person may not feel constant burning or pressure during the reflux period. A couple of different symptoms for heartburn include a problem swallowing and inflammation of the esophagus.