Tendonitis is an inflammation or irritation of a tendon, a thick cord that attaches bone to muscle. Tendinitis is most often caused by repetitive, minor impact on the affected area, or from a sudden more serious injury.
Tendinitis can occur in almost any area of the body where a tendon connects a bone to a muscle. The most common places are:
- Base of the thumb
- Elbow
- Shoulder
- Hip
- Knee
- Achilles tendon