The ulnar nerve
The ulnar nerve passes behind the inner bump of the elbow (the medial epicondyle) through the cubital tunnel, then down the forearm and into the hand through Guyon’s canal. Bending the elbow stretches and compresses the nerve, which is why symptoms often worsen with the elbow bent.
Symptoms
- Tingling or numbness in the little finger and half of the ring finger.
- Aching on the inner elbow and forearm.
- Symptoms worse with the elbow bent or leaning on it.
- Night-time symptoms if sleeping with arms bent.
- Weak grip, clumsiness and difficulty with fine tasks.
- Wasting of the muscles between the thumb and index finger in severe cases.
Cubital tunnel syndrome (elbow)
This is the most common site of ulnar nerve compression. Causes include prolonged elbow bending, leaning on the elbow, the nerve slipping over the bone (subluxation), previous fractures, arthritis and swelling.
See golfer’s elbow and elbow bursitis.
Guyon’s canal (wrist)
Compression at the wrist is less common and is linked to cycling (pressure on handlebars), ganglion cysts and repetitive use of tools. It affects the fingers and hand muscles, but sensation on the back of the hand is usually spared.
Other causes of similar symptoms
- A trapped nerve root in the neck (C8 radiculopathy).
- Thoracic outlet syndrome.
- Peripheral neuropathy.
- Rarely, conditions affecting the nerves or spinal cord.
See nerve entrapment and arm numbness.
Tests: nerve conduction studies and EMG
Nerve conduction studies measure how quickly signals travel along the ulnar nerve; slowing across the elbow confirms cubital tunnel syndrome. Electromyography (EMG) assesses whether the hand muscles have lost nerve supply. These tests show the site and severity, guide treatment and help decide whether surgery is needed. Ultrasound can show nerve swelling or movement.
What you can do
- Avoid keeping your elbow bent for long periods.
- Use a headset or speaker for phone calls.
- Do not lean on your elbows; use padding if needed.
- Keep your arm straighter at night with a splint or towel wrapped around the elbow.
- Adjust your desk so your elbows are not sharply bent.
Ulnar nerve glides
Gentle nerve glides help the nerve move freely. A common sequence starts with the arm out to the side, palm down, then bends the wrist back and slowly bends the elbow, bringing the palm towards the ear. Move slowly, for 5 to 10 repetitions, and stop if tingling becomes strong.
See nerve glides.
Strengthening exercises
- Finger spreading against a rubber band.
- Pinch strengthening with putty.
- Grip strengthening with a soft ball.
- Shoulder blade and posture exercises.
See forearm pain.
When surgery is needed
Surgery is considered for weakness, muscle wasting, severe nerve test results, or persistent symptoms after 3 to 6 months of non-surgical treatment. Options include releasing the tunnel and moving the nerve to the front of the elbow. Recovery of sensation and strength can take months.
Outlook
Mild cases often improve with activity changes and splinting. Long-standing compression with muscle wasting may not fully recover even after surgery, which is why early assessment matters.
Work and sport adjustments
- Use a headset for calls to avoid holding a phone to your ear.
- Pad armrests and avoid resting elbows on hard surfaces.
- Adjust your chair so the elbows are open at more than 90 degrees.
- Cyclists can use padded gloves and change hand position often.
When to seek prompt help
- Weakness or clumsiness of the hand.
- Visible muscle wasting in the hand.
- Constant numbness.
- Symptoms in both hands or with neck pain and leg symptoms.
- Symptoms after an elbow fracture or dislocation.
Key points to remember
- Ulnar nerve entrapment causes tingling in the ring and little fingers.
- The elbow (cubital tunnel) is the most common site.
- Nerve conduction studies and EMG confirm site and severity.
- Avoiding elbow bending, splints and glides help; surgery is for severe cases.
Questions about ulnar nerve entrapment
These answers are general information and do not replace an examination or individual medical advice.
What does ulnar nerve pain feel like?
Tingling or numbness in the ring and little fingers and aching at the inner elbow.
How do you fix ulnar nerve entrapment?
Avoid elbow bending and pressure, use a night splint and do gentle exercises; surgery for severe cases.
Do ulnar nerve glides help?
They can help some people when done gently.
How is cubital tunnel syndrome diagnosed?
By examination and nerve conduction studies with EMG.
Can ulnar nerve entrapment heal on its own?
Mild cases often improve with activity changes.
Why is my ulnar nerve worse at night?
Sleeping with bent elbows increases pressure on the nerve.
When is surgery needed?
With weakness, wasting, severe test results or persistent symptoms.
Can cycling cause ulnar nerve problems?
Yes, pressure at the wrist on handlebars can compress the nerve.
Is ulnar nerve entrapment serious?
It can cause permanent weakness if severe and untreated.
Sources
- MedlinePlus · Ulnar nerve dysfunction
- MedlinePlus · Electromyography (EMG) and nerve conduction studies
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.