When the tunnel becomes crowded or inflamed, pressure can build on the nerve.
This can cause:
- Numbness in the thumb, index finger, middle finger, and part of the ring finger
- Tingling that worsens at night
- Weakness when gripping objects
- Difficulty holding small items
Many people first notice symptoms while sleeping.
Other Possible Causes
Carpal tunnel syndrome isn’t the only explanation.
Several other conditions may also cause numbness in the hands.