Esophagitis may cause left shoulder blade back pain. Esophagitis is an inflammation of the mucosa of the esophagus due to irritation or injury, and can be categorized as reflux esophagitis and erosive esophagitis. Irritation of the esophagus by reflux material causes pain, which occurs behind the sternum. In severe cases, it can be a severe stabbing pain that radiates to the back of the chest, shoulders and neck, behind the ears, and sometimes resembles angina. Corrosive esophagitis is characterized by burning or severe pain in the mouth, throat and posterior sternum, which can also radiate to the left side of the back, such as the shoulder blade. In addition, patients should pay attention to light diet, eat small meals, avoid smoking and alcohol, avoid lying down immediately after meals, appropriate exercise, obese people need to reduce weight, while maintaining a relaxed mood. If the patient is diagnosed with esophagitis, it is recommended to go to the regular hospital in a timely manner, after the cause of the disease is clear, under the guidance of the doctor for targeted treatment to reduce the adverse effects of the disease.