Axillary nerve dysfunction is nerve damage that leads to a loss of movement or sensation in the shoulder.
Neuropathy - axillary nerve
Causes, incidence, and risk factors
Axillary nerve dysfunction is a form of peripheral neuropathy. It occurs when there is damage to the axillary nerve, which supplies the deltoid muscles of the shoulder and the skin around it. A problem with just one nerve, such as the axillary nerve, is called mononeuropathy.
The usual causes are:
Long-term pressure on the nerve
Pressure on the nerve from nearby body structures
Entrapment creates pressure on the nerve where it passes through a narrow structure.
The damage may destroy the myelin sheath that covers the nerve, or part of the nerve cell (the axon). Damage of either type reduces or prevents the movement of impulses through the nerve.
Conditions that can lead to axillary nerve dysfunction include:
Body-wide (systemic) disorders that cause nerve inflammation
Depending on the cause of the nerve disorder, some people do not need treatment. They will get better on their own. However, the rate of recovery can be different for everyone. It can take many months to recover.
Anti-inflammatory medications may be given if you have:
Small changes in sensation or movement
No history of injury to the area
No signs of nerve damage
These medicines reduce swelling and pressure on the nerve. They may be injected directly into the area or taken by mouth.
Other medicines include:
Over-the-counter pain medicines may be helpful for mild pain (neuralgia).
Other medications (phenytoin, carbamazepine, gabapentin, pregabalin, duloxetine, or tricyclic antidepressants such as nortriptyline) may reduce the stabbing pains that some people experience.
Opiate pain relievers, such as morphine or fentanyl, may be needed to control severe pain.
Whenever possible, avoid or reduce medication use to lessen the risk of side effects.
If your symptoms continue or get worse, you may need surgery. Surgery may be done to see if a trapped nerve is causing your symptoms. In this case, surgery to release the nerve may help you feel better.
Physical therapy may help you maintain muscle strength. Job changes, muscle retraining, or other forms of therapy may be recommended.
It may be possible to make a full recovery if the cause of the axillary nerve dysfunction can be identified and successfully treated.
Deformity of the arm, shoulder contracture, or frozen shoulder
Call for an appointment with your health care provider if you have symptoms of axillary nerve dysfunction. Early diagnosis and treatment increase the chance of controlling symptoms.
Preventive measures vary, depending on the cause. Avoid putting pressure on the underarm area for a long period of time. Make sure casts, splints, and other appliances fit properly. When you use crutches, learn how to avoid putting pressure on the underarm.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by Joseph V. Campellone, MD, Division of Neurology, Cooper University Hospital, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.