Subcutaneous emphysema occurs when air gets into tissues under the skin. This most often occurs in the skin covering the chest wall or neck, but can also occur in other parts of the body.
Subcutaneous emphysema can often be seen as a smooth bulging of the skin. When a health care provider feels (palpates) the skin, it produces an unusual crackling sensation (crepitus) as the gas is pushed through the tissue.
This is a rare condition. When it does occur, possible causes include:
This condition can happen due to:
Air can also be found in between skin layers on the arms and legs or torso after certain infections, including gas gangrene, and after scuba diving. (Scuba divers with asthma are more likely to have this problem than other scuba divers.)
Most of the conditions that cause subcutaneous emphysema are very severe, and you are likely already being treated by a provider. Sometimes a hospital stay is needed. This is more likely if the problem is due to an infection.
If you feel subcutaneous air in relation to any of the situations described above, particularly after trauma, call 911 or your local emergency services number immediately.
DO NOT administer any fluids. DO NOT move the person unless it is absolutely necessary to remove them from a hazardous environment. Protect the neck and back from further injury when doing so.
The provider will measure and monitor the person's vital signs, including:
Symptoms will be treated as needed. The person may receive:
The prognosis depends on the cause of the subcutaneous emphysema. If associated with major trauma, a procedure or infection, the severity of those conditions will determine the outcome.
Subcutaneous emphysema associated with scuba diving is most often less serious.
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Emeritus, Virginia Mason Medical Center, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.