As a man, if you have left-sided chest pain. First, we need to consider the pain of cardiac origin, such as angina pectoris, heart attack, etc. Most of the pain is located behind the sternum, in the precordial region or under the fenestra, and sometimes it can radiate to the left shoulder and the inner side of the left arm. The second thing that needs attention is pleurisy. Most of the pain caused by pleural inflammation is predominantly in the lateral chest wall and is aggravated by deep breathing and coughing. Most of the pain caused by pleurisy will be accompanied by coughing, coughing, fever and other symptoms of infection. Third, if the site of chest pain is located in the anterior chest wall and the local pressure pain is more obvious, it is generally considered to be caused by costochondritis. Fourth, if the left-sided chest pain is in the quarter rib area, accompanied by acid reflux, belching, loss of appetite and other digestive symptoms, this pain is often caused by gastritis and gastric ulcer. Therefore, it is recommended that the specific cause of the left chest pain be clarified by timely consultation at the hospital and corresponding examination.