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Subcutaneous emphysema can be caused by medical procedures and medical conditions that cause the pressure in the alveoli of the lung to be higher than that in the tissues outside of them. Its most common causes are pneumothorax and a chest tube that has become occluded by a blood clot or fibrinous material.
Subcutaneous Emphysema Causes. One of the basic causes of subcutaneous crepitation is the seepage of air through the lacerations on skin caused by stabbing, blunt trauma or bullet wounds. Due to the muscular movements the air is readily drawn in and rapidly spreads to the neck and chest cavity.