Understanding Carpal Tunnel Syndrome: Causes, Symptoms, and Expert Treatment

What Is Carpal Tunnel Syndrome?

Carpal tunnel syndrome (CTS) is the most common nerve compression disorder of the upper limb. It occurs when the median nerve — which runs from the forearm into the palm of the hand — becomes pressed or squeezed at the wrist inside a narrow passageway called the carpal tunnel.

The carpal tunnel is formed by the small wrist (carpal) bones on the bottom and the strong transverse carpal ligament across the top. Inside this rigid tunnel, nine flexor tendons and the median nerve must coexist in a remarkably compact space. When swelling or thickening of the tendons narrows this space, the median nerve is compressed, leading to the characteristic symptoms of CTS.

Who Is at Risk?

Carpal tunnel syndrome affects approximately 3–6% of the general adult population, with women being three times more likely to develop the condition than men. Several factors increase the risk:

Repetitive hand and wrist movements — Prolonged keyboard use, assembly-line work, or sustained gripping activities can contribute to tendon irritation within the tunnel.
Pregnancy and hormonal changes — Fluid retention during pregnancy or menopause can increase pressure within the carpal tunnel.
Medical conditions — Diabetes, rheumatoid arthritis, thyroid disorders, and kidney failure are associated with a higher incidence of CTS.
Wrist anatomy — Some individuals are born with a naturally smaller carpal tunnel, predisposing them to compression.
Previous wrist injuries — Fractures or dislocations of the wrist can alter the tunnel geometry, narrowing the available space for the nerve.

Recognising the Signs and Symptoms

CTS typically develops gradually. The earliest signs are often easy to dismiss, but recognising them early can make a significant difference in treatment outcomes.

Early-Stage Symptoms

Tingling and numbness in the thumb, index, middle, and ring fingers — often described as “pins and needles.”
Night-time awakening — many patients report waking with numb or tingling hands and needing to “shake them out” to restore sensation.
A vague feeling of hand clumsiness, particularly when performing fine tasks like buttoning a shirt.

Progressive Symptoms

As the condition advances, symptoms become more persistent and intrusive:

Constant numbness in the fingertips, reducing the ability to feel temperature and texture.
Weakness in grip strength — patients often report dropping objects or struggling to open jars.
Thenar muscle wasting — in severe, prolonged cases, the muscles at the base of the thumb visibly shrink, leading to significant loss of hand function.

If you are experiencing persistent tingling, numbness, or weakness in your hand, it is important to seek specialist assessment rather than waiting for symptoms to resolve on their own. Early diagnosis leads to more effective treatment and better long-term outcomes.

How Is Carpal Tunnel Syndrome Diagnosed?

A thorough clinical assessment by a specialist hand surgeon is the cornerstone of diagnosis. At our practice, Mr. Bhat conducts a detailed history and comprehensive examination, which typically includes:

Clinical Tests

Tinel’s Sign — Gentle tapping over the median nerve at the wrist to reproduce tingling in the fingers.
Phalen’s Test — Holding the wrists in a flexed position for 60 seconds to see if this provokes numbness or tingling.
Assessment of grip and pinch strength — Using calibrated dynamometers to objectively measure any functional deficit.
Sensory testing — Evaluating two-point discrimination and light touch in the median nerve distribution.

Diagnostic Investigations

Nerve conduction studies (NCS) — An electrodiagnostic test that measures the speed at which electrical signals travel through the median nerve. Slowed conduction across the wrist is the hallmark finding in CTS.
Ultrasound scanning — Increasingly used to visualise swelling of the median nerve and any space-occupying lesions within the carpal tunnel.

Treatment Options

The treatment approach depends on the severity, duration, and underlying cause of the symptoms.

Non-Surgical Management

For mild to moderate CTS, especially when symptoms are intermittent:

Wrist splinting — A custom-made night splint holds the wrist in a neutral position, preventing the flexion that increases tunnel pressure during sleep. Many patients experience significant relief within a few weeks.
Activity modification — Identifying and modifying repetitive activities that exacerbate symptoms.
Corticosteroid injection — A single injection of steroid into the carpal tunnel can reduce inflammation and relieve symptoms. This can serve as both a therapeutic intervention and a diagnostic tool — a strong positive response to injection supports the diagnosis and often predicts a good surgical outcome.
Hand therapy — A qualified hand therapist can provide nerve gliding exercises and ergonomic advice to reduce symptoms.

Surgical Treatment: Carpal Tunnel Release

When non-surgical measures fail to provide lasting relief, or when nerve conduction studies show significant nerve compression, carpal tunnel release surgery is recommended. This is one of the most commonly performed hand operations in the UK.

The procedure involves:

A small incision (typically 2–3 cm) at the base of the palm.
Division of the transverse carpal ligament, which forms the roof of the carpal tunnel.
This immediately increases the volume within the tunnel, relieving pressure on the median nerve.

The operation is performed under local anaesthesia as a day-case procedure, meaning you can go home the same day. The entire procedure typically takes around 15–20 minutes.

What to expect after surgery:

The tingling and night-time symptoms often improve almost immediately.
Grip strength recovery is more gradual, typically returning over 6–12 weeks.
Pillar pain (tenderness at the base of the palm) is common in the early weeks and resolves with time.
Most patients can return to light duties within 2 weeks and unrestricted activities within 4–6 weeks.

When Should You Seek Help?

We encourage you to seek specialist advice if you experience:

Persistent or worsening numbness or tingling in your fingers.
Difficulty with fine motor tasks such as picking up small objects.
Night-time symptoms that regularly disturb your sleep.
Visible wasting of the muscles at the base of your thumb.

Early intervention can prevent irreversible nerve damage. If you would like to discuss your symptoms with a specialist hand surgeon, please do not hesitate to contact our team.

Mr. Murali Bhat is a Consultant Orthopaedic Surgeon specialising in hand, wrist, and upper limb conditions. He practises at Kings Oak Hospital and The Cavell Hospital in Enfield, North London.