Left chest discomfort, left hand numbness may be some kind of physiological phenomenon; can also be the symptomatic manifestation of certain diseases, such as coronary heart disease, cervical spondylosis, etc., should be timely consultation to identify the cause of the disease. Healthy people who keep a posture for a long time, such as sleeping on the left side at night, may also have left chest discomfort, left hand numbness, but can be relieved afterward. If the cause is pathologic, it may be related to coronary heart disease or cervical spondylosis. When patients with coronary heart disease suffer from angina pectoris or myocardial infarction, they may experience chest tightness and discomfort in the left chest, accompanied by tingling in the hands and feet. When patients suffer from cervical spondylosis, it may compress the nerves and cause corresponding symptoms, such as numbness in the arms. The symptoms of left chest discomfort and numbness of the left arm should be promptly consulted, and the doctor should be asked to clarify the cause of the disease, and the corresponding treatment should be carried out if necessary.