Symptoms of vague pain over the left chest may be caused by trauma, pleural disease, lung infection, esophageal disease or heart disease. 1. Trauma: If there is a vague pain above the left chest, it may be caused by trauma. When trauma occurs, the chest muscles and ribs are damaged, and the symptoms of hidden pain above the left chest will appear. 2. Pleural disease: if the patient has symptoms of vague pain in the upper left chest accompanied by chest tightness and shortness of breath, it may be caused by pleural disease such as pleurisy. 3. Lung infections: if the patient has vague pain in the upper left chest accompanied by fever, hemoptysis, cough and other symptoms, it may be caused by tuberculosis, pneumonia and other lung infections. 4. Esophageal diseases: some patients with esophageal diseases may have symptoms of vague pain in the upper left chest, which need to be confirmed by relevant examinations. 5. Heart disease: If middle-aged or elderly patients have symptoms of vague pain above the left chest, they should go to the hospital in time to exclude the possibility of heart attack and angina. If the symptoms of pain in the upper left chest, it is recommended to consult a doctor in time to identify the cause of the disease and standardize the treatment under the guidance of the doctor.