1. Swallowing hot food, sharp foreign objects or inadequately chewed bones, and accidentally ingesting corrosives can directly damage the esophageal mucosa and cause inflammation. Veterinary personnel to dogs and cats with gastric catheter instillation, rough use of gastric catheter, often can damage the esophageal mucosa. 2, physical or chemical esophagitis: radiation exposure caused by esophagitis reaction called radioactive esophagitis. Drugs such as quinidine, tetracycline, potassium chloride, and iron stimulate the esophageal mucosa, especially when tablets are stagnant in the esophagus, and can also cause esophagitis. Esophagitis caused by overheated food can heal quickly on its own. Frequent use of a gastric tube, which stimulates the esophagus, can also cause esophagitis. 3, Antibiotics used for too long, resulting in the proliferation of fungal esophageal mucosa causing infection. 4, lower esophageal sphincter function is reduced: normal people have a high pressure area in the lower esophageal tract muscle to prevent reflux of gastric contents into the esophagus. Many reasons can make the lower esophageal sphincter weaken, including esophageal hiatal hernia, which can easily cause regurgitation of gastric and intestinal contents into the esophagus and is the main cause of inflammatory lesions in the esophageal mucosa. 5, increased abdominal pressure: such as a large amount of ascites, pregnancy, resulting in increased abdominal pressure, prone to the formation of reflux. 6, esophageal peristaltic disorders: usually, when the stomach contents reflux into the esophagus, the effect of tension causes secondary peristaltic waves in the esophagus, sending the reflux back into the stomach. Esophagitis can slow down the peristalsis of the esophagus, making the reflux stay longer in the esophagus, aggravating the original esophagitis, and esophagitis weakens the function of the lower esophageal sphincter, aggravating reflux, forming a vicious circle.