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Overview

What Is Carpal Tunnel Syndrome?

Carpal tunnel syndrome occurs when the median nerve is compressed as it passes through the narrow carpal tunnel in the wrist. This nerve helps provide feeling and movement to parts of the hand. Symptoms usually affect the thumb, index finger, middle finger, and the thumb side of the ring finger. The condition can affect anyone, but it is more common in women and adults in middle age.

Symptoms

Carpal Tunnel Syndrome Symptoms

Carpal tunnel symptoms may begin gradually and may come and go at first. They often affect the thumb, index finger, middle finger, and part of the ring finger. Symptoms may worsen during sleep or after repeated hand use, such as gripping or bending the wrist.

  • Numbness or tingling (paresthesia) in the affected fingers.
  • Burning or electric-like sensations in the hand or wrist.
  • Wrist or hand discomfort that is worse at night.
  • Weakness when gripping or pinching.
  • Dropping objects because of reduced hand control.
  • Reduced coordination during fine hand movements.

Causes

Causes of Carpal Tunnel Syndrome

Swelling or reduced space inside the carpal tunnel can increase pressure on the median nerve and cause carpal tunnel syndrome. Several conditions or activities may contribute to this pressure, and a single cause is not always identifiable.

  • A naturally narrow carpal tunnel can leave less room for the median nerve.
  • Swelling around the wrist can increase pressure inside the tunnel.
  • Pregnancy-related fluid changes can temporarily increase nerve pressure.
  • Diabetes can make nerves more vulnerable to compression.
  • Thyroid disease and inflammatory arthritis can contribute to swelling or nerve problems.
  • A previous wrist injury can change the shape or space of the carpal tunnel.
  • Repeated forceful gripping or awkward wrist positions may aggravate symptoms.

Risk Factors

Risk Factors for Carpal Tunnel Syndrome

Medical and Other Risk Factors

  • A family history of carpal tunnel syndrome may increase risk.
  • Women and adults in middle age are affected more often.
  • Pregnancy can increase the risk because of temporary fluid retention.
  • Diabetes, thyroid disease, and inflammatory arthritis can raise risk.
  • A prior wrist fracture or other wrist structural change can increase risk.

Work and Activity Factors

  • Forceful or repetitive gripping can aggravate pressure on the wrist nerve.
  • Regular exposure to vibrating hand tools may increase risk.
  • Prolonged wrist bending during work or activity may contribute to symptoms.

Complications

Complications of Carpal Tunnel Syndrome

Persistent compression of the median nerve can cause worsening numbness, reduced sensation, thumb-muscle weakness, and difficulty with gripping or fine motor tasks. Without appropriate care, these changes may interfere with work, daily activities, and hand function.

SEEK MEDICAL ADVICE

Do not ignore progressive symptoms

Severe or longstanding nerve compression may cause muscle wasting or permanent nerve damage. Arrange prompt evaluation if weakness is progressing or numbness becomes constant.

Diagnosis

How Carpal Tunnel Syndrome Is Diagnosed

Clinicians review where symptoms occur, when they appear, what triggers them, and how they affect hand function. They also consider your medical history and examine sensation, strength, and the wrist. This evaluation helps distinguish carpal tunnel syndrome from other causes of hand symptoms.

  • A physical examination can assess sensation, thumb strength, and muscle changes.
  • Wrist-position tests may reproduce symptoms but are interpreted with the rest of the evaluation.
  • Nerve conduction studies and electromyography can measure how well the median nerve works.
  • Ultrasound can show the median nerve and structures within the carpal tunnel.
  • Additional testing may help identify neck nerve compression, arthritis, or another cause of hand symptoms.

Treatment & Management

Carpal Tunnel Treatment and Management

Carpal tunnel treatment depends on symptom severity, how long symptoms have lasted, their effect on function, test results, and any underlying condition contributing to nerve compression. A clinician can help select conservative care, medication or injection treatment, or surgery based on these factors.

CONSERVATIVE CARE

Nighttime wrist splinting in a neutral position and changes that reduce forceful gripping or prolonged wrist bending may ease symptoms. Clinician-guided pain relief may also be considered.

TREAT CONTRIBUTING CONDITIONS

Managing conditions such as diabetes, thyroid disease, or inflammatory arthritis may support overall nerve health and reduce contributing swelling or nerve stress.

When Treatment Escalates

WHEN TREATMENT ESCALATES

Injections and surgery

A corticosteroid injection may provide short-term relief for selected people. Carpal tunnel release surgery creates more space for the median nerve and may be recommended for progressive weakness, muscle wasting, severe nerve-test abnormalities, or symptoms that do not improve with nonsurgical treatment.

Outlook and Prognosis

Outlook and Prognosis

Mild or temporary cases may improve with appropriate management, while prolonged severe compression can cause lasting nerve or muscle changes. The outlook depends on the severity and duration of compression, underlying health conditions, and how well the nerve responds to treatment.

  • Earlier evaluation generally offers a better chance of preventing permanent nerve damage.
  • Symptoms related to pregnancy or temporary swelling may improve when the contributing change resolves.
  • Recovery after surgery can take time, especially when nerve compression was severe or longstanding.
  • Some people continue to have numbness or weakness after treatment if nerve damage was advanced.
  • Symptoms can return if pressure on the median nerve develops again.

When Should You See a Doctor

When Should You See a Doctor?

  • See a clinician for persistent numbness, tingling, or pain in the hand or wrist.
  • Arrange an evaluation when symptoms repeatedly wake you at night.
  • Seek care if hand weakness causes dropping objects or difficulty with routine tasks.
  • Ask for medical advice when symptoms are worsening or spreading.
  • Get evaluated when symptoms could be coming from the neck, elbow, or another nerve condition.

GET URGENT HELP

Recognize urgent symptoms

Sudden complete loss of hand function, a severe injury, or new weakness with other neurological symptoms requires urgent medical assessment. Do not assume these symptoms are caused by carpal tunnel syndrome.

Tests & Procedure

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Symptoms

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