Possible causes of scapular pain include muscle strain, disk disease, heart conditions, fractures and shingles, according to About.com. Shoulder blade pain may require immediate medical attention because of its association with serious heart problems, especially aortic dissection, explains WebMD.
Muscle strain that is caused by overuse of the muscles of the arms and torso is the most common cause of scapular pain, explains About.com. Some lung conditions such as Pancoast tumors, pulmonary emboli and pneumothorax can result in shoulder pain. Certain types of abdominal conditions such as gallstones and peptic ulcer disease can also result in referred pain to the shoulder blades.