Left chest pain in men may be related to chest muscle injury, coronary heart disease, tuberculosis, pleural disease and so on. 1. Chest muscle injury: such as strenuous exercise caused by the left chest muscle injury, local aseptic inflammation, causing left chest pain symptoms. 2. Coronary heart disease: coronary heart disease can cause coronary artery stenosis, occlusion, when the coronary artery oxygen supply is insufficient to cause myocardial ischemia, resulting in left chest pain. 3. Respiratory diseases: such as pneumonia, tuberculosis, pulmonary embolism, pneumothorax, lung tumors, etc., may cause left chest pain. 4. Chest wall diseases: such as rib fracture due to trauma, costochondritis, pleurisy, etc., the main symptom is chest pain, which is manifested as stabbing or pulling pain, and the symptom will be aggravated by coughing, deep breathing and activities. It is recommended that men with symptoms of left chest pain should go to the hospital in time to find out the cause of treatment under the guidance of the doctor.