Carpal tunnel syndrome is caused by pressure on the median nerve. This nerve runs from your forearm, through the carpal tunnel (a passageway in your wrist), to your hand. The median nerve provides sensation to the palm side of your fingers and allows you to move the muscles at the base of your thumb.
When this nerve gets irritated or squeezed, you start feeling the symptoms of carpal tunnel syndrome.
Some ways the median nerve can get irritated include:
- Repetitive strain
- Injuries such as a wrist fracture or dislocation that narrow the carpal tunnel passage
- Chronic illnesses that affect the nerves, such as diabetes