Symptoms of left chest suffocation, the first thing to consider is lung disease, for example, there is no spontaneous pneumothorax caused by lung compression, a chest X-ray can be clear. Secondly, it is the lung infection or tracheal lesions caused by pulmonary atelectasis, resulting in partial loss of function of lung tissues or lung space-occupying lesions, compressed to the airway caused by ventilation dysfunction caused by. Particularly serious is pulmonary artery embolism, caused by large alveolar and capillary ventilation dysfunction caused by symptoms, the above diseases can also be clearly diagnosed by lung CT examination. Then there is the heart coronary artery or heart valve lesions, such as various causes of coronary artery stenosis or infarction, resulting in myocardial ischemia or valve regurgitation and other symptoms caused by cardiac insufficiency, this is more often accompanied by panic, shortness of breath, through the electrocardiogram, cardiac ultrasound, and cardiac enzymes can be initially diagnosed.