Definition
Tendinitis is inflammation, irritation, and swelling of a tendon, which is the fibrous structure that joins muscle to bone. In many cases, tendonosis (tendon degeneration) is also present.
Alternative Names
Calcific tendinitis; Bicipital tendinitis
Causes
Tendinitis can occur as a result of injury, overuse, or with aging as the tendon loses elasticity. It can also be seen in
systemic diseases such as
rheumatoid arthritis or diabetes. Tendinitis can occur in any tendon, but some commonly affected sites are the shoulder, the wrist, the heel (
Achilles tendonitis), and the elbow.