Overview
Carpal tunnel syndrome is a common nerve compression problem that affects the hand and wrist. The median nerve passes through a tight passage called the carpal tunnel, and swelling or irritation there can press on the nerve. This can lead to numbness, tingling, burning discomfort, and weakness in the thumb, index, middle, and part of the ring finger. Symptoms often worsen with wrist positions that increase pressure inside the tunnel, especially during sleep.
Symptoms
People with carpal tunnel syndrome commonly notice tingling, numbness, or a burning feeling in the thumb, index, middle, and sometimes the ring finger. Symptoms frequently flare with activities that bend or strain the wrist, such as typing, gripping, texting, driving, or using tools. Many patients also report waking at night due to hand symptoms and needing to shake or reposition the hand for relief. Over time, persistent nerve irritation can contribute to hand weakness and reduced grip strength or fine finger control.
Causes
Carpal tunnel syndrome develops when the median nerve is compressed within the carpal tunnel, most often due to swelling of the tissues that travel through the space. Repetitive wrist motion and forceful gripping can contribute to irritation and increased pressure. In some cases, underlying conditions such as diabetes, thyroid disease, inflammatory arthritis, pregnancy-related fluid shifts, or wrist injuries change tunnel space or nerve vulnerability.
Risk Factors
Risk increases in people who perform repetitive hand or wrist activities, use vibrating tools, or work with prolonged wrist bending or awkward grip positions. Certain health conditions, including diabetes, hypothyroidism, inflammatory arthritis, and pregnancy, can raise the likelihood of nerve compression. A history of wrist fracture or other wrist trauma, as well as heredity or smaller carpal tunnel anatomy, can also contribute.
Prevention
You can reduce risk by keeping the wrist in a neutral position during daily activities, using ergonomic supports, and taking frequent micro-breaks from repetitive tasks. Adjusting hand tool use, reducing gripping force, and avoiding long periods of wrist flexion or extension can help limit irritation. Managing underlying conditions such as diabetes and thyroid disorders, and maintaining overall wrist health through gradual strengthening and conditioning, may lower the chance of recurrence.
How the Diagnosis Is Evaluated
Clinicians typically start with a history of symptoms, including nighttime numbness, activity triggers, and which fingers are affected. A physical exam looks for median nerve distribution sensory changes, hand weakness patterns, and provocative tests such as Tinel's sign or Phalen's maneuver. If symptoms are persistent, unclear, or there is concern for nerve damage, nerve conduction studies and electromyography can confirm the diagnosis and assess severity. Imaging is not always required, but it may be used if there is concern for structural causes like a mass or significant wrist injury.
Nonsurgical Treatment Options
Initial care usually focuses on reducing pressure on the median nerve with wrist splinting, especially at night, and activity modifications to avoid sustained wrist bending. Anti-inflammatory medications may help with pain and swelling when appropriate for your medical history. Hand therapy can teach nerve gliding exercises, ergonomic changes, and strengthening progression tailored to your symptoms. Many patients benefit from a corticosteroid injection into the carpal tunnel to reduce inflammation and improve numbness or tingling, particularly when symptoms flare. Platelet rich plasma (PRP) injections may be considered in some settings, but evidence is still evolving, and results can vary.
When to Seek Medical Attention
Seek prompt medical attention if numbness, tingling, or weakness is worsening quickly, or if you notice dropping objects or increasing difficulty with fine finger tasks. Get urgent care sooner if you have severe hand weakness, rapidly progressive symptoms, or new symptoms after a traumatic wrist injury. Contact a clinician promptly if symptoms persist despite initial self-care or continue to disrupt sleep. Also seek immediate evaluation for red-flag symptoms such as fever, significant swelling with redness, or other signs of systemic illness.
Frequently Asked Questions
Many people improve with conservative care such as splinting, activity changes, therapy, and sometimes steroid injections, especially when treated early.
Sleeping with bent wrists can increase pressure in the carpal tunnel, irritating the median nerve.
Next Steps
If you suspect carpal tunnel syndrome, start by reducing activities that aggravate wrist bending, consider a nighttime wrist splint in a neutral position, and note which fingers are affected. If symptoms persist for more than a few weeks, worsen, or cause weakness or significant sleep disruption, schedule an evaluation with a clinician for an exam and appropriate testing.