Left shoulder blade seam pain is not a signal of serious illness, but may indicate the presence of cervical dorsal myofasciitis, cervical spondylosis, scapulothoracic myositis, rhomboid myositis and other diseases. 1. Cervical dorsal myofasciitis: due to long-term activity of the scapula or cold stimulation, it will lead to inflammatory reaction of the muscles and fascia of the back of the neck, resulting in local tissue edema, fibrous degeneration and causing pain in the scapular crease and limitation of activities. 2. Cervical spondylosis: when suffering from neurogenic cervical spondylosis, frequent tiptoe activities will cause nerve discharge, which will lead to muscle spasm of the cervical back muscles and cause pain. 3. Scapulothoracic myositis: the position of the scapular suture is the starting point of the scapulothoracic muscle, prolonged sitting or prolonged standing will lead to strain on the scapulothoracic muscle, which will cause inflammation and lead to pain at the scapulothoracic suture. 4. Rhomboid myositis: the starting point of rhomboid muscle is near the position of scapular suture, if the excessive movement of scapula will lead to aseptic inflammation of rhomboid muscle, which will lead to pain at the starting and stopping point of the muscle. Therefore, when the left scapular suture pain, should pay attention to, timely to the hospital for a comprehensive examination, in order to clarify the diagnosis and active treatment.