The short answer
Cubital tunnel syndrome is compression of the ulnar nerve behind the inner elbow — the 'funny bone' nerve — causing numbness and tingling in the ring and little fingers, especially with the elbow bent, plus grip weakness over time. Many cases improve with activity changes, night splinting, nerve-gliding exercises, and ultrasound-guided hydrodissection; surgery is reserved for severe or progressive nerve compression.
Medically reviewed by Marc Gruner, DO, MBA, RMSK
Sports medicine physician, Mayo Clinic fellowship. Last reviewed June 2026
Overview
The ulnar nerve travels through a narrow tunnel behind the inner elbow, where it is vulnerable to pressure and stretch. When it is compressed or irritated, the ring and little fingers feel numb or tingly — classically when the elbow is bent for a while, such as holding a phone or sleeping — and the hand can weaken if it persists.
Dr. Gruner first addresses the mechanical drivers: avoiding prolonged elbow flexion and leaning on the elbow, night splinting to keep the elbow straighter, and nerve-gliding exercises. Ultrasound-guided hydrodissection can free the nerve from surrounding adhesions in select cases; surgery is considered when compression is severe or the nerve shows progressive changes.
Common symptoms
- Numbness and tingling in the ring and little fingers
- Symptoms worse with the elbow bent
- Weak grip or pinch
- Aching along the inner elbow
What to expect at your visit
- 1.
A focused conversation
Dr. Gruner reviews your history, prior imaging, and goals — what you want to get back to doing.
- 2.
Point-of-care ultrasound
When useful, a diagnostic musculoskeletal ultrasound evaluates the injury in real time, with no radiation.
- 3.
A clear, individualized plan
You leave understanding the diagnosis, the non-surgical options, and the expected timeline — in plain language.
Frequently asked questions
- Can cubital tunnel syndrome be treated without surgery?
- Often, yes — especially when caught early. Activity modification, night splinting to keep the elbow straighter, nerve-gliding exercises, and in some cases ultrasound-guided hydrodissection can relieve symptoms. Surgery is reserved for severe compression, muscle wasting, or a nerve that continues to worsen.