Carpal Tunnel Syndrome: Symptoms, Causes & Treatment
Waking at night with a numb, tingling hand — or feeling a sharp wrist ache after a long day of typing — can point to carpal tunnel syndrome. Ignoring these signals risks permanent nerve damage. The good news is that with early diagnosis, both non-surgical and surgical options reliably restore comfort and grip strength.
What Is Carpal Tunnel Syndrome?
The carpal tunnel is a narrow, rigid passageway of ligaments and bones at the base of the hand. It houses the median nerve and the tendons that bend the fingers. Carpal tunnel syndrome occurs when this tunnel narrows or the surrounding tissues swell, putting pressure on the median nerve.
The median nerve controls sensation in the thumb, index, middle, and ring fingers, as well as the muscles around the base of the thumb. When compressed, the nerve cannot function properly — producing pain, numbness, and loss of sensation.
What Causes Carpal Tunnel Syndrome?
Several factors typically work together to compress the median nerve. Identifying the contributing causes is essential for an effective treatment plan.
- —Repetitive hand motion — Typing, assembly line work, or any task that demands constant wrist flexion aggravates the tendons.
- —Health conditions — Diabetes, rheumatoid arthritis, and thyroid disorders all raise risk.
- —Anatomical factors — A naturally smaller tunnel leaves less room for the nerve, making compression more likely.
- —Pregnancy — Hormonal changes and fluid retention can trigger temporary nerve compression.
- —Wrist injury — Fractures, sprains, or repeated trauma can narrow the tunnel or inflame surrounding tissue.
Symptoms
Symptoms typically start gradually and worsen if left untreated. Catching them early gives the best chance of stopping nerve damage from progressing.
- —Numbness and tingling — Felt in the thumb, index, middle, or ring fingers — but rarely the little finger. Often described as an electric-shock sensation.
- —Wrist pain — A dull ache or sharp pain in the wrist that can travel up the arm toward the shoulder.
- —Nighttime discomfort — Symptoms frequently wake people from sleep because most people sleep with their wrists bent.
- —Weakness and grip loss — A weakened grip and unexpected dropping of objects, caused by reduced control of the thumb’s pinching muscles.
Conditions Often Misdiagnosed as Carpal Tunnel
Hand and arm pain can stem from many sources, so doctors must rule out other underlying issues. Proper diagnosis often requires a physical examination plus nerve conduction studies or an electromyogram (EMG).
A nerve root in the cervical spine becomes compressed, and the resulting pain, numbness, and tingling radiate down the arm into the hand. Because the symptoms mirror median nerve compression, it is easy to confuse with carpal tunnel — but cervical radiculopathy usually includes neck pain and symptoms that shift when the neck moves.
Inflammation of the wrist or hand tendons causes severe pain and swelling. Tendonitis typically does not produce the classic numbness of nerve compression, but the burning pain can feel very similar. Arthritis in the wrist or thumb joint presents overlapping symptoms as well, and only a specialist exam can reliably differentiate joint pain from nerve pain.
Treatment Options
Treatment depends on the severity of symptoms and how long they have been present. When caught early, non-surgical methods successfully alleviate most cases and restore normal hand function.
The simplest first step is to stop or reduce the activities that provoke symptoms. Frequent breaks meaningfully reduce swelling. If your work requires repetitive motion, look into ergonomic changes — adjusting the keyboard, desk height, or switching to an ergonomic mouse takes pressure off the wrist.
Targeted stretching helps the median nerve glide smoothly through the tunnel. A physical therapist can teach specific nerve-gliding exercises that reduce pressure and improve wrist mobility.
Over-the-counter NSAIDs such as ibuprofen manage pain and swelling. For more severe flare-ups, a corticosteroid injection placed directly into the carpal tunnel can provide powerful, localised relief by reducing inflammation around the median nerve.
Wrist Braces and Splints
One of the most effective and accessible treatments is bracing the wrist. A splint holds the wrist in a neutral, straight position — preventing the flexion that compresses the tunnel and giving the nerve room to recover.
Night splints are especially helpful. Most people naturally curl their wrists while sleeping, which severely compresses the nerve and triggers nighttime pain. A splint worn during sleep keeps the joint straight and allows the nerve to rest.
When choosing a splint, prioritise comfort and rigidity. The brace should feature a hard metal or plastic stay to prevent bending, but be padded enough to sleep in. Lighter, more flexible splints can be used during the day for support while typing or working.
Carpal Tunnel Surgery
When non-surgical treatments fail to provide relief, or if symptoms are severe and causing muscle wasting, surgery may be recommended. The procedure — a carpal tunnel release — involves cutting the transverse carpal ligament that forms the roof of the tunnel, removing pressure on the median nerve.
The surgeon makes a small incision in the palm of the hand to view the inside of the wrist and divide the ligament directly.
A tiny camera attached to a tube allows the surgeon to see inside the carpal tunnel through one or two very small incisions. This approach often produces less post-operative pain.
Most patients experience significant relief from nighttime pain and tingling almost immediately. Numbness and weakness can take weeks or even months to fully resolve as the nerve slowly heals. Physical therapy after surgery is often essential to restore grip strength and wrist flexibility.
ICD-10 Codes for Carpal Tunnel Syndrome
Medical providers use specific diagnostic codes for billing and documentation. The primary ICD-10 code for carpal tunnel syndrome is G56.0, with expanded codes indicating which side is affected.
- —G56.01 — Right upper limb (right wrist).
- —G56.02 — Left upper limb (left wrist).
- —G56.03 — Bilateral carpal tunnel syndrome — both wrists affected.
These codes ensure proper tracking of medical records and are essential for insurance claims, treatment approvals, and disability filings.
When to See a Specialist
If hand pain, numbness, or weakness is disrupting your sleep or making daily tasks difficult, do not wait. Ignoring these signs can lead to permanent nerve damage and irreversible muscle loss in the thumb — changes that no later surgery can fully reverse.
A medical specialist can perform the necessary tests for an accurate diagnosis and design a personalised treatment plan to get you back to a pain-free routine.
Get Expert Hand & Wrist Care
Early intervention is the difference between a quick recovery and lasting nerve damage. If hand pain, tingling, or weakness is interrupting your sleep or work, schedule an evaluation with an experienced orthopaedic specialist to protect your hands and restore your quality of life.
