Symptoms of reflux esophagitis include heartburn, acid reflux, laryngitis, and coughing, and do not usually involve left armpit pain. Reflux esophagitis is a type of gastroesophageal reflux disease (GERD) caused by damage to the esophageal mucosa from gastric and duodenal contents that reflux into the esophagus. Symptoms can be categorized into esophageal and extraesophageal symptoms caused by reflux irritation. Symptoms of reflux-irritation-induced esophageal symptoms include heartburn, dysphagia, and chest pain, with heartburn being the characteristic manifestation, often occurring one hour after meals. Extraesophageal symptoms mainly include asthma, cough, hoarseness after waking up from sleep, and otitis media. It is mainly the irritation of refluxed gastroduodenal contents that causes disease in the corresponding organs. Generally speaking, reflux esophagitis does not cause pain in the left armpit, but do not rule out rare exceptions, the specific situation is recommended to the hospital, under the guidance of the doctor standardized diagnosis and treatment.