Carpal tunnel syndrome is the most common nerve compression problem of the upper extremity. It occurs when the median nerve is compressed as it passes through the carpal tunnel at the wrist. The result is a combination of numbness, tingling, pain, and hand weakness that can affect sleep, work, and fine motor control.
Why It Happens
The carpal tunnel is a narrow passage bordered by wrist bones and a thick ligament. If the available space decreases or the contents swell, pressure inside the tunnel increases and the nerve becomes irritated.
Common contributing factors include:
- Repetitive gripping or wrist-loading activities
- Diabetes and thyroid disease
- Pregnancy-related fluid retention
- Inflammatory conditions
- Structural narrowing of the tunnel
Some patients have clear workplace or activity-related aggravation, but in many cases the condition is multifactorial.
Common Symptoms
Carpal tunnel syndrome often begins gradually. Typical symptoms include:
- Numbness or tingling in the thumb, index, middle, and part of the ring finger
- Night pain or waking up with the hand “asleep”
- Weak pinch strength
- Clumsiness with buttons, zippers, or small objects
- A tendency to shake the hand for relief
When compression becomes more severe or longstanding, thenar muscle weakness and visible muscle wasting can occur.
Diagnosis
Diagnosis starts with a careful history and examination. Symptoms, distribution of numbness, and weakness patterns are important. Provocative maneuvers such as Phalen’s test or Tinel’s sign may help, but they are only one part of the picture.
Electrodiagnostic testing, including nerve conduction studies and electromyography, may be used to confirm the diagnosis, assess severity, or distinguish carpal tunnel syndrome from cervical radiculopathy and other nerve disorders.
Ultrasound can also show median nerve swelling and may support diagnosis in selected cases.
Non-Surgical Treatment
In mild or early cases, treatment can begin conservatively. Options may include:
- Night splinting in a neutral wrist position
- Activity modification
- Anti-inflammatory measures
- Treatment of contributing medical conditions
- Carefully selected corticosteroid injection
Splinting is especially helpful when nighttime symptoms are prominent. Injection can reduce inflammation and provide short-term relief, but recurrence is possible if the underlying compression persists.
When Surgery Becomes the Better Option
Surgery is considered when symptoms are persistent, progressive, or severe, especially when:
- Night symptoms continue despite conservative care
- Hand weakness is developing
- Nerve testing shows significant compression
- Daily function is clearly affected
Carpal tunnel release is designed to relieve pressure by dividing the ligament that forms the roof of the tunnel. It can be performed with open or endoscopic techniques depending on the case and surgical preference.
Recovery After Release
Many patients notice improvement in nighttime symptoms relatively early, but recovery of strength and sensation may take longer. Duration depends on how severe the compression was before surgery and how long the nerve had been affected.
Early goals after surgery generally include:
- Wound care
- Control of swelling and discomfort
- Gradual use of the hand
- Preventing stiffness
If the nerve had been compressed for a long time, full recovery of sensation may be incomplete. Early treatment usually offers the best chance of nerve recovery.