If the patient has pain inside the scapula on the left side, the specific reasons are as follows: 1, to consider whether there is trauma and cause, if there is trauma to the left scapula and lead to fracture or rib fracture, contusion, contusion of the surrounding soft tissue, pain symptoms will appear at the scapula. 2, for example, rheumatoid arthritis, rheumatoid arthritis, pain will also appear in the scapula. 3, cardiogenic diseases, such as coronary heart disease , unstable angina, myocarditis, heart valve disease, infective pericarditis, hypertrophic obstructive cardiomyopathy, painful symptoms will also appear in the left scapula. 4, respiratory system diseases, such as tension pneumothorax, pleurisy, pleural effusion, massive pneumonia, will also lead to painful symptoms in the left scapula.