Neuropathy - distal median nerve
Distal median nerve dysfunction is a form of peripheral neuropathy that affects the movement of or sensation in the hands.
A common type of distal median nerve dysfunction is carpal tunnel syndrome.
Dysfunction of one nerve group, such as the distal median nerve, is called a mononeuropathy. Mononeuropathy usually means there is a local cause of the nerve damage. Diseases affecting the entire body (systemic disorders) can also cause isolated nerve damage.
This condition occurs when the nerve is inflamed, trapped, or injured by trauma. The most common reason is trapping (entrapment) by a ligament in the wrist. Trapping puts pressure on the nerve where it passes through a narrow area. Wrist fractures may injure the median nerve directly. Or, it may increase the risk for trapping the nerve later on.
Inflammation of the tendons (tendonitis) or joints (arthritis) can also put pressure on the nerve. Some repetitive movements increase the chance of developing carpal tunnel entrapment. Women are more affected than men.
Problems that affect the tissue near the nerve or cause deposits to form in the tissue can block blood flow and lead to pressure on the nerve. Such conditions include:
In some cases, no cause can be found. Diabetes can make this condition worse.
Symptoms may include any of the following:
Your health care provider will examine your wrist and ask about your medical history. Tests that may be done include:
Treatment is aimed at the underlying cause.
If the median nerve is affected by carpal tunnel syndrome, a wrist splint can reduce further injury to the nerve and help relieve symptoms. Wearing the splint at night rests the area and decreases inflammation. An injection into the wrist may help with symptoms, but it won't fix the underlying problem. Surgery may be needed if a splint or medicines don't help. Using proper ergonomics at work is essential. For example, you should use proper wrist support if you use a keyboard and mouse for computer work.
For other causes, treatment may involve any of the following:
If the cause of the nerve dysfunction can be identified and treated, there is a good chance of full recovery. In some cases, there is some or complete loss of movement or sensation. Nerve pain may be severe and persist for a long time.
Complications may include:
Call your provider if you have symptoms of distal median nerve dysfunction. Early diagnosis and treatment increase the chance of curing or controlling symptoms.
Prevention varies, depending on the cause. In people with diabetes, controlling blood sugar may reduce the risk of developing nerve disorders.
For people with jobs that involve repetitive wrist movements, a change in the way the job is performed may be needed. Frequent breaks in activity may also help.
Craig A. Neuropathies. In: Cifu DX, ed. Braddom's Physical Medicine and Rehabilitation. 6th ed. Philadelphia, PA: Elsevier; 2021:chap 41.
Katirji B. Disorders of peripheral nerves. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 106.
Toussaint CP, Kvint S, Ali ZS, Zager EL. Distal entrapment syndromes: carpal tunnel, cubital tunnel, peroneal, and tarsal tunnel. In: Winn HR, ed. Youmans and Winn Neurological Surgery. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 276.
Waldman SD. Carpal tunnel syndrome. In: Waldman SD, ed. Atlas of Common Pain Syndromes. 4th ed. Philadelphia, PA: Elsevier; 2019:chap 50.BACK TO TOP
Review Date: 4/25/2022
Reviewed By: Joseph V. Campellone, MD, Department of Neurology, Cooper University Hospital, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Health Content Provider
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2023 A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.