Esophagitis is an inflammatory disease in which multiple factors cause edema and congestion in the esophageal mucosa. The causes of esophagitis are as follows: 1. Reflux esophagitis caused by gastroesophageal reflux is the most common form of esophagitis. Due to impaired anti-reflux barrier function such as relaxation of the lower esophageal sphincter, gastric contents can flow back into the esophagus causing damage to the esophageal mucosa. 2. Corrosive esophagitis: Corrosive esophagitis can result from self-inflicted injuries or accidental ingestion of corrosive chemical agents, commonly seen in children, such as household cleaners containing sodium (potassium) hydroxide, sodium (potassium) carbonate, potassium permanganate, etc. Corrosive esophagitis in adults is often caused by swallowing strong acids or bases or poisons that cause damage to the esophageal mucosa. 3, drug esophagitis caused by non-steroidal anti-inflammatory drugs is also very common. 4, infectious esophagitis: viral and mycobacterial infections lead to inflammation of the esophageal mucosa. 5, physical injury: the stimulation of certain foods (such as overheated or irritating foods) can also cause damage to the esophageal mucosa and cause esophagitis. Excessively hard or sharp objects can directly scratch or puncture the esophageal wall. The clinical symptoms of esophagitis are similar from one cause to another, and usually include difficulty swallowing, pain behind the sternum, or a burning sensation. High fever may also occur if there is a secondary bacterial infection. For esophagitis, it is important to go to the hospital for a detailed examination and then treat with medication under the guidance of a doctor.