Abnormal relaxation of the cardiac sphincter muscle of the stomach so that gastric contents reflux into the oesophagus, leading to regurgitation.
An excessive relaxation of the oesophageal muscles, which causes regurgitation.
Abnormal relaxation of a muscle or opening especially of the sphincter muscle between the esophagus and stomach, resulting in reflux of stomach contents into the esophagus and regurgitation. Treatment involves a diet of frequent small meals and, in infants, feeding in the upright position.