If a person has left-sided back pain with chest tightness, cardiovascular disease, such as coronary heart disease, angina pectoris, myocardial ischemia, is considered first. If it is accompanied by sweating, panic, shortness of breath and can be relieved by containing quick-acting heart pills or nitroglycerin, you can basically consider angina attack and need to go to the hospital for further ECG examination or blood test. If there is also pressure pain in the right side of the abdomen and pressure pain in the gallbladder area, consider the reflex left-sided back pain caused by cholecystitis attack. Also pay attention to the possibility of left-sided pneumothorax, you can go to the hospital to take X-rays to clarify the diagnosis.