Tenosynovitis (say "ten-oh-sin-uh-VY-tus") means the lining of a tendon is inflamed. This problem usually affects tendons in your thumb and wrist. A tendon is a cord that joins muscle to bone.
Tenosynovitis can be caused by an injury. Or it may be caused by repeating a movement over and over, such as when you knit, lift things, or play video games. In rare cases, an infected wound causes it.
In most cases, you can recover fully. But if the problem is caused by doing something over and over and you don't stop or change doing that, it may come back.
Call your doctor now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor if:
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