A tendon is thick, bendable tissue that connects muscle to bone. Two tendons run from the back of your thumb down the side of your wrist. De Quervain tendinitis is caused when these tendons are swollen and irritated.
More About Your Injury
De Quervain tendinitis can be caused by playing sports such as tennis, golf, or rowing. Constantly lifting children can also strain the tendons in the wrist and lead to this condition.
If you have De Quervain tendinitis, you may notice:
- Pain on the back of your thumb when you make a fist, grab something, or turn your wrist
- Numbness in the thumb and index finger
- Swelling of the wrist
- Stiffness when moving your thumb or wrist