The patient suffered from tooth decay, prolonged mouth ulcers, went to many places, saw many otolaryngologists, otolaryngologists, but still did not reduce the disease. It was time to see a gastroenterologist, found that the patient had reflux esophagitis, and the doctor concluded that the patient's condition was caused by reflux esophagitis. What are the characteristics of this disease? Why can reflux esophagitis cause long-term oral pathologies? This article will address that issue.