Esophagitis is an inflammation of the esophageal mucosa that occurs when the mucosa is stimulated by a variety of factors that cause damage to the esophageal mucosa. Common factors that can cause esophagitis include physical stimuli (including hot food, beverages, etc.), and chemical stimuli (including strong acids, strong bases, non-steroidal anti-inflammatory drugs or other stimulating drugs or poisons, etc.). One of the most common is inflammation of the esophagus due to gastroesophageal reflux. Due to the reflux of gastric contents into the esophagus leads to the mucosal damage of the esophagus, in mild cases, edema, congestion, or even only microscopically visible damage, and in severe cases, mucosal breakage, or even ulceration, can be seen with the naked eye under the gastroscope. Its clinical manifestations are diverse, varying in severity, often with esophageal symptoms and extraesophageal symptoms. The main symptoms of reflux esophagitis are acid reflux, heartburn, chest pain, and regurgitation of food. Inflammation of the esophagus is recurrent, and those with esophageal strictures may experience dysphagia. Gastrointestinal bleeding occasionally occurs when ulcers involve blood vessels, but is relatively rare. Typical main manifestations of esophagitis: acid reflux after eating, heartburn, pain in swallowing and pain behind the chest are prevalent, and the sensation becomes more pronounced when lying down or bending over. As esophagitis progresses, it can cause constriction of the esophagus and narrowing of the lumen, resulting in “gagging” and even vomiting when swallowing food. Bleeding from esophagitis is rare, but in a few people it may cause gastrointestinal bleeding and black stools. Atypical manifestations of esophagitis include pain behind the chest, a foreign body sensation behind the chest, or even a choking sensation; in some cases, reflux occurs at night, usually after sleeping. Gastroesophageal reflux can also cause problems related to the pharynx and even the respiratory tract. Chronic pharyngolaryngitis, hoarseness, pulmonary fibrosis, chronic cough, etc. are all closely related to gastroesophageal reflux. Therefore, once you have symptoms of esophagitis, it is best to go to the hospital for a checkup to find out the cause of the disease and then do targeted treatment.