Scapular pain in the left shoulder can be caused by factors such as exertion, trauma, frozen shoulder or cervical spondylosis. 1. Exertion: mostly seen in people who have been engaged in physical labor for a long period of time, excessive exertion leads to chronic strain of local muscles of the scapula (such as scapularis, supraspinatus, infraspinatus, etc.), thus causing aseptic inflammation and then pain. 2. Trauma: serious trauma to the scapula, causing local fracture or soft tissue edema, and then pain. 3. Frozen shoulder: It may be due to the strain of the left shoulder, cold and other factors, thus the left shoulder scapula pain. 4. Cervical spondylosis: caused by compression of the cervical nerve, resulting in left shoulder scapula pain. There are many other causes of scapular pain in the left shoulder, such as heart disease, lung disease, etc. It is recommended to consult a doctor in a timely manner to clarify the cause of the disease and then targeted treatment.