The key points

Tingling and numbness in the hand can have more than one cause.

Carpal tunnel syndrome occurs when the median nerve is compressed at the wrist. It commonly causes tingling or numbness in the thumb-side fingers, often at night, but other nerve or health conditions can produce similar symptoms. Assessment helps distinguish these causes and decide whether splinting, further testing or specialist care is appropriate.

What symptoms are typical?

Carpal tunnel syndrome (CTS) is caused by pressure on the median nerve as it passes through the carpal tunnel on the palm side of the wrist. The usual sensory symptoms involve the thumb, index and middle fingers and the thumb-side of the ring finger; the little finger is generally spared. People may describe pins and needles, numbness, burning or aching, sometimes felt into the forearm.

Symptoms can disturb sleep or appear during activities such as driving, holding a phone or keeping the wrist bent. If nerve compression persists, numbness may become more constant and thumb strength may reduce, making small objects or buttons harder to handle. These patterns can suggest CTS, but they do not confirm it by themselves.

Why can it happen?

The carpal tunnel contains the median nerve and tendons that bend the fingers. Increased pressure in this confined space can irritate the nerve. Often there is no single identifiable cause. Pregnancy-related fluid changes, diabetes, thyroid disease, inflammatory arthritis and previous wrist injury are among factors associated with CTS.

Forceful gripping, vibration or sustained wrist positions may aggravate symptoms for some people. Typing alone does not establish the cause, and symptoms should not automatically be attributed to a particular job or activity.

How is carpal tunnel syndrome assessed?

Assessment begins with the history: which fingers are affected, when symptoms occur, how long they have been present and whether there is weakness or loss of hand function. A clinician may examine sensation and thumb strength and consider the neck, other nerves and general health conditions that can produce overlapping symptoms.

For a typical presentation, diagnosis is often made clinically. The 2024 AAOS guideline supports using a structured clinical assessment, such as CTS-6, rather than routinely ordering ultrasound or nerve-conduction studies for everyone. Further testing may be considered when the picture is uncertain, symptoms are severe or the result could change the next step.

Musculoskeletal ultrasound can show the median nerve and nearby soft tissues, but it does not measure electrical nerve conduction. Any scan finding needs to be interpreted alongside symptoms and examination; an ultrasound scan is not required for every person with possible CTS.

What treatments may help?

For milder or intermittent symptoms, a wrist splint that keeps the wrist near neutral while sleeping may help. It is usually tried consistently for several weeks. Avoiding prolonged wrist bending and adjusting tasks that clearly provoke symptoms may also help while keeping the hand gently active. Evidence for hand exercises is limited, so exercises should not be presented as a guaranteed way to release the nerve.

A corticosteroid injection may ease symptoms for a time in some people, but it is not a lasting cure. The 2024 AAOS guideline concludes that corticosteroid injection does not provide long-term improvement. If symptoms are severe, continue to worsen or have not improved with suitable non-surgical care, a specialist may discuss carpal tunnel release surgery.

Recovery depends on how long and how severely the nerve has been affected. Persistent numbness or thumb weakness deserves review rather than repeated self-treatment.

When to seek advice

Arrange an assessment if numbness or tingling is persistent, worsening, repeatedly disturbing sleep or affecting work and everyday tasks. Seek prompt medical review if sensation is becoming constant, thumb strength is declining, you are dropping objects or the muscles at the base of the thumb look smaller. Sudden major weakness after an injury needs urgent assessment.

Resolve MSK Clinic · Bond Street, Hull

Start with the pattern of symptoms, not the scan alone.

At Resolve MSK Clinic, 44 Bond Street, Hull, assessment considers your symptom pattern, wrist and hand function, and whether the neck or another nerve may be contributing. A focused wrist ultrasound can be discussed when it is likely to answer a relevant clinical question; we explain when nerve-conduction testing or specialist review may be more appropriate.

Read about private physiotherapy in Hull and our wrist ultrasound service, or contact the clinic.

Sources and further reading

Published 12 October 2026. Evidence checked 12 October 2026. General information for adults; it does not diagnose the cause of your symptoms or replace individual assessment. Review due October 2027, or sooner if relevant guidance changes.