The superficial or deep mucous membrane of the esophagus can become edematous and congested if the tissues are stimulated abnormally, which can lead to inflammation and the formation of esophagitis. The examination of esophagitis is usually performed as follows, the first choice is the fiberoptic endoscopy, in which the mucous membrane of the lower and middle esophagus can be seen to be congested and edematous, and the surface of the esophagus can be observed to be eroded and some small shallow ulcers, sometimes visible as strictures. Acid drip test: Acid drip test can be used as a diagnostic method to stimulate the symptoms of the patient. Esophageal pressure measurement: In quiet conditions, the lower esophageal sphincter is under pressure, and in patients with gastric and esophageal reflux, the pressure is reduced. Esophageal diet test: The peristalsis of the esophagus may be weakened and the mucosal wall of the lower esophagus may be coarse and disorganized, sometimes with small niches and strictures. Determination of esophageal pH: The pH value of the esophagus can be measured to observe the condition of reflux. If necessary, a 24-hour esophageal PH monitoring test can be done to better understand the circadian rhythm of esophageal PH. If the disease is delayed, it will cause serious consequences, and the patient will receive more pain, and the treatment time will become longer.