Which statement best defines the clinical distinction between occasional heartburn and gastroesophageal reflux disease (GERD)?

Heartburn refers to pain exclusively caused by cardiac ischemia with no relation to the esophagus; GERD is the result of an underactive pyloric sphincter allowing bile to damage the stomach lining, leading to chronic nausea and immediate vomiting after meals.

Heartburn and GERD are identical terms used interchangeably; both refer to erosion of the stomach lining by infection with Helicobacter pylori that causes chest pain and requires antibiotic therapy, and the terms have no temporal distinction.

Heartburn is any discomfort within the abdomen from overeating, while GERD is defined as a psychosomatic condition that mimics heart disease and is best treated by psychotherapy and avoidance of fatty foods.

Heartburn is occasional retrosternal burning due to transient reflux; GERD is chronic frequent reflux that causes persistent esophageal mucosal injury and potential complications.