Carpal Tunnel Symptoms: Early Signs, Causes and Treatment

01What

What is carpal tunnel syndrome?

The carpal tunnel is a narrow passage in the wrist formed by wrist bones and a tough ligament (the transverse carpal ligament). The median nerve and nine tendons that bend the fingers run through it. Swelling or tightness in the tunnel squeezes the nerve and causes symptoms in the part of the hand it supplies: the thumb, index finger, middle finger and half of the ring finger (not the little finger). See hand tendonitis and tendinitis de muñeca (Spanish).

02Early

Early symptoms

• Tingling, pins and needles or burning in the thumb, index, middle and half of the ring finger.
• Symptoms that wake you at night, relieved by shaking or flicking the hand.
• Numbness when holding a phone, steering wheel, book or when typing.
• A swollen feeling in the fingers even without visible swelling.
• Pain in the wrist or forearm, sometimes up toward the elbow or shoulder.
• Symptoms in one or both hands; the dominant hand is often first.
• Little finger spared: if it is involved, think of another cause.

03Later

Later signs that need attention

• Weak grip and difficulty gripping a jar, opening a bottle or pinching.
• Dropping objects and clumsiness with buttons or small tasks.
• Constant numbness rather than intermittent.
• Wasting of the thumb muscle (thenar eminence).
• Loss of feeling in the fingertips and altered temperature sensation.
• Persistent night pain.
• These indicate more significant nerve compression and deserve prompt assessment.

04Causes

Causes and risk factors

• Repetitive hand and wrist use, vibration tools and forceful gripping.
• Wrist position: prolonged flexion or extension, as in typing, driving, or sleeping with bent wrists.
• Pregnancy, due to fluid retention; often resolves after birth.
• Diabetes and thyroid disease (underactive thyroid).
• Rheumatoid arthritis and other inflammatory conditions.
• Obesity, and female sex (three times more common in women).
• Wrist fracture or injury, arthritis or a cyst.
• Menopause, kidney disease and some medicines.
• Family history, as a small carpal tunnel runs in families.

05Dx

How it is diagnosed

• History and examination of the hand, checking sensation, strength and thumb muscle.
• Tinel’s sign: tapping over the wrist reproduces tingling.
• Phalen’s test: holding the wrists flexed for a minute reproduces symptoms.
• Nerve conduction studies and electromyography to confirm and grade the compression.
• Ultrasound or MRI occasionally.
• Blood tests for diabetes, thyroid disease or inflammatory conditions.
• Neck examination, because a pinched nerve in the neck can mimic carpal tunnel.

06Splint

First-line treatment: splinting and activity changes

• Wear a wrist splint in a neutral position (not bent) at night for at least 4–6 weeks, and during aggravating activities by day.
• Avoid prolonged wrist flexion or extension, forceful gripping and repetitive movements; take frequent breaks.
• Adjust your workstation: keep wrists straight when typing, use a soft keyboard wrist rest, a vertical mouse if helpful.
• Keep hands warm, and avoid vibrating tools or use padded gloves.
• Anti-inflammatories for short periods.
• Treat contributing conditions: diabetes, thyroid disease, weight.
• Many mild cases, especially in pregnancy, resolve or settle with these steps.

07Exercise

Exercises and nerve glides

• Median nerve glides: a sequence of gentle hand and wrist positions (fist, fingers straight, thumb out, palm up, thumb pulled gently) held for a few seconds each; repeat 5 times, a few times a day.
• Tendon gliding exercises: straight hand, hook fist, full fist, table-top and straight fist.
• Gentle wrist stretches for flexors and extensors, 15–30 seconds, without forcing.
• Shoulder and neck posture exercises to reduce tension in the arm.
• Stop if symptoms worsen; a hand therapist can guide you.
• Evidence for exercise alone is modest, but it can complement splinting.

08Medical

Injections and surgery

• Corticosteroid injection into the carpal tunnel often gives relief for weeks to months and can help diagnose.
• Carpal tunnel release surgery cuts the transverse ligament to free the nerve, open or endoscopic; done as a day case, with success rates of about 90% for relieving numbness and pain.
• Surgery is recommended when symptoms are severe, constant, associated with weakness or wasting, or fail to respond to conservative treatment.
• Recovery: light use within days, full strength in weeks to months; scars can be tender initially.
• Early surgery prevents irreversible nerve damage.

10Cases

Three common situations

An office worker with night tingling in the right hand: wear a neutral night splint, adjust the keyboard and mouse and take breaks.

A pregnant woman with tingling in both hands in the third trimester: splints and positioning usually settle it; it often resolves after birth.

A person with constant thumb numbness and weak grip for months: needs nerve studies and possibly surgery.

11Summary

Key points to remember

Carpal tunnel syndrome causes tingling and numbness in the first three fingers, worse at night. A neutral wrist splint, activity changes and treating contributing conditions help early on, and surgery works well when symptoms are severe or persistent. Seek assessment early to prevent nerve damage. Our physiotherapy team can plan your treatment.

This guide is for general information and does not replace an assessment by your own doctor or physiotherapist.