Pathology · single question
GERD (Gastroesophageal reflux disease) is primarily caused by dysfunction of which structure?
Show answer and explanation
Correct answer: B. Lower esophageal sphincter (LES)
GERD = dysfunction/weakness of the lower esophageal sphincter (LES) → gastric acid refluxes into esophagus. Dental relevance: causes palatal erosion on maxillary anterior teeth. Source confirms: 'GERD is caused by: Lower esophageal sphincter.'
- A. Ileocecal valve separates small/large intestine — not involved in GERD.
- B. CORRECT. LES dysfunction → GERD → acid reflux. Causes palatal erosion in dental patients.
- C. Upper esophageal sphincter dysfunction causes swallowing difficulties — not GERD.
- D. Pyloric sphincter dysfunction = pyloric stenosis — not GERD.