The left chest is higher than the right chest may be caused by long-term left-handed movement, left costochondritis and developmental deformity. 1. Long-term left-handed movement: if the patient regularly uses his left hand and does some physical strength and gravity work, it is easy to cause the left pectoral muscle to be more developed than the right pectoral muscle, which will easily lead to the symptom that the left chest is higher than the right chest. 2. Left costochondritis: if the patient’s left costochondral inflammatory lesion occurs, it will lead to abnormal proliferation of the left side, which will also easily lead to the phenomenon that the patient’s left chest is higher than the right chest. 3. Pleural effusion: due to congestive heart failure, tuberculosis and other diseases cause the left thoracic cavity effusion, resulting in the left side of the rib space is full, the thorax is more protruding, the phenomenon of the left chest appears to be higher than the right chest. 4. Developmental deformity: congenital thoracic developmental deformity can also lead to the left chest is higher than the right chest. When the patient appears the phenomenon of the left chest is higher than the right chest, if it is caused by the disease should go to the local regular hospitals for timely consultation, improve the relevant examination, timely treatment of the cause.