Gastroesophageal reflux is the backflow of acid from the stomach into the esophagus. This occurs when there is a relaxation of the valve that connects the stomach and the esophagus, which is called the lower esophageal sphincter. When reflux occurs, it can sometimes cause inflammation of or damage to the esophagus lining, which is referred to as esophagitis or erosive esophagitis. For some people, reflux can lead to a diagnosis of Barrett’s esophagus. Barrett’s esophagus is when the lining of the esophagus changes to look like the lining of the stomach, which can lead to cancer in a small number of patients, but for most patients, reflux is not this severe. Reflux is, however, the leading cause of solid food dysphagia.