Wallerian Degeneration: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Wallerian Degeneration?
Most people with nerve damage see a neurologist, a doctor who treats problems of the brain, spinal cord, and nerves; a rehabilitation (physical medicine) doctor or a surgeon who repairs nerves may also be involved depending on the injury. A direct primary care or concierge doctor can be a good first stop, examining you, ordering tests, and referring you to the right specialist.
What it is
Wallerian degeneration is the process that happens when a nerve fiber is damaged. The part of the fiber farthest from the brain or spinal cord then breaks down over days and weeks, and the body tries to clean up the debris and, in some cases, regrow the fiber. It is named after Augustus Waller, who first described it in the 1800s. Nerves outside the brain and spinal cord have a better ability to regrow.
Symptoms
The symptoms depend on which nerve was hurt and where. Common problems include weakness in a muscle, numbness or tingling, and loss of feeling in part of the body. Damage to nerves in the brain or brainstem can cause trouble swallowing, while damage in the brain or spinal cord can also make it hard to move an arm or leg.
Causes and who gets it
Any injury that damages a nerve fiber can lead to Wallerian degeneration. Common causes include physical injury from an accident, surgery, or a cut; strokes; long-lasting pressure on a nerve; some infections; and some diseases that attack nerves. It is not inherited and it is not contagious.
How doctors diagnose it
Doctors do not diagnose Wallerian degeneration with a single test. Instead, they look for signs of it while figuring out the cause of a nerve problem, asking about the injury or illness and examining muscles, reflexes, and sensation. An MRI scan can show changes in nerves, and electromyography can measure how well the nerves supplying muscles are working.
Treatment
Treatment focuses on the cause of the injury and on helping the person recover as much function as possible; there is no medicine that directly reverses it. Relieving pressure on a nerve may help, and treating a stroke or disease comes first. Physical therapy is often part of care, and some people regain function over months, though others have lasting weakness or numbness.
When to see a doctor
Anyone with sudden weakness, numbness, trouble speaking, or trouble swallowing should get medical care right away, because these can be signs of a stroke. Slowly worsening numbness or weakness, or symptoms following an injury, should also be checked.
Common questions
Is Wallerian degeneration permanent?
It depends on the nerve and the injury. Nerves outside the brain and spinal cord can often regrow over months. Nerves inside the brain and spinal cord usually recover less completely.
Does Wallerian degeneration hurt?
The process itself does not cause pain. Nerve damage can cause pain in some people, though, and this varies from person to person.
Can it show up on a scan?
Yes. An MRI scan can show changes in the brain, spinal cord, or nerves that suggest Wallerian degeneration. Doctors often use these images along with other tests.
How long does recovery take?
Recovery can take weeks to many months, and results differ from person to person. Some people regain full function and others do not.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
