Left posterior chest pain may be stomach pain, but also reflux esophagitis, angina, rib pain, pleuritic pain and so on. 1. Gastroparesis: Gastric disorders, such as gastric ulcer located in the posterior wall of the stomach, can present with left posterior chest pain. 2. Reflux esophagitis: Reflux esophagitis can cause left posterior chest pain, which may be accompanied by acid reflux. 2. Angina pectoris: Angina pectoris is usually caused by excessive mood swings and increased oxygen consumption, and the patient may experience left posterior chest pressure pain. 3. Rib pain: soft rib osteochondritis caused by viral infection, there will be chest pain, mostly in the left chest and back. 4. Pleuritic pain: Infectious diseases, autoimmune diseases and malignant tumors can cause pleurisy, resulting in left posterior chest pain. It is recommended that patients with left posterior chest pain go to regular hospitals in time to improve the relevant examinations and standardize the treatment under the guidance of doctors to avoid delaying the condition or causing adverse reactions.