Carpal tunnel syndrome happens when pressure builds around the median nerve as it passes through a narrow space at the wrist. The familiar symptoms are numbness, tingling, burning or weakness in the thumb, index and middle fingers, although the exact pattern varies from person to person.
The diagnosis is not made from a symptom checklist alone. A clinician considers the story, examines the hand and may order nerve testing or imaging when the result would change the plan.
Common symptoms
- Numbness or tingling in the thumb, index, middle and sometimes part of the ring finger
- Symptoms that wake you at night or are worse after holding a phone, steering wheel or book
- Clumsiness with buttons, keys or small objects
- Weakness or thinning of the muscle at the base of the thumb in more advanced cases
Why the median nerve is affected
The carpal tunnel contains the median nerve and the tendons that bend the fingers. Swelling, changes in the wrist bones, tendon-lining inflammation and some medical conditions can reduce the available space or increase its contents.
Symptoms can also come from the neck, forearm or another part of the nerve. That is why the evaluation looks beyond the wrist when the pattern is unusual.
Treatment options
Nonsurgical care may include a neutral-position wrist splint at night, activity changes, treatment of contributing conditions, hand therapy and a selected corticosteroid injection. These options may settle symptoms or help clarify how the nerve responds.
Carpal tunnel release is considered when symptoms remain meaningful despite nonsurgical care or when examination and testing show ongoing nerve damage. The operation releases the ligament that forms the roof of the tunnel; the decision and timing depend on the individual findings.
When to arrange an evaluation
Make an appointment when numbness is persistent, symptoms are waking you regularly, the hand is becoming weak, or the problem is interfering with work and daily tasks. Sudden loss of hand function, a cold or pale hand, or severe symptoms after an injury need prompt medical attention.
Sources and further reading
Frequently asked questions
Does carpal tunnel syndrome always need surgery?
No. Splinting, activity changes, treatment of contributing conditions and selected injections help many people. Surgery is discussed when symptoms persist, recur or show signs of nerve damage.
Can numbness in the hand come from somewhere other than the wrist?
Yes. Nerve irritation can occur at the neck, shoulder, elbow or forearm, and more than one site can sometimes be involved. The examination is used to sort through those possibilities.