There are many reasons for a bout of pain above the left chest, such as digestive system diseases, heart diseases, pleural lesions and so on. 1. Digestive system diseases: gastritis, gastric ulcer, reflux esophagitis and other diseases will not only lead to a burst of pain in the upper left chest, but also accompanied by nausea, belching, gastric distension and other phenomena. 2. Heart disease: angina pectoris, myocardial infarction can cause discomfort in the precordial region, thus causing a burst of pain in the upper part of the left chest, accompanied by a sense of dying, dyspnea, chest tightness and other phenomena. 3. pleural lesions: intercostal neuritis, pleurisy and other diseases, can also cause a bout of pain in the upper left chest, may be related to long-term late-night, stress, smoking and drinking, pneumonia history. There are many reasons for the pain in the upper left chest, after the symptoms, we suggest that we go to the hospital in time, follow the doctor’s instructions to take standardized treatment, do not ignore the symptoms, take it lightly.