Tendinitis (also called tendonitis) is inflammation of a tendon, the fibrous cord that attaches a muscle to bone. Tenosynovitis is inflammation of the sheath of tissues that encloses a tendon.
These conditions usually occur together and are most commonly caused by overuse—for example, due to playing sports. Occasionally, they may be due to an infection or a disorder such as rheumatoid arthritis. The areas most commonly affected are the shoulder, elbow, wrist, fingers, knee, and back of the heel.
Symptoms in the affected area may include pain and swelling; stiffness and restricted movement; warm, red skin over the tendon; and a lump over the tendon.
Occasionally, there may be a crackling sensation when the tendon moves, or a joint may stick in one position.
In most cases, the conditions can be treated with rest, ice packs to reduce inflammation, pain relievers, and a bandage, splint, or brace to support the affected area. A doctor may also recommend corticosteroid injections to reduce inflammation. Physical therapy may also be recommended.
Any underlying disorder may also need treatment

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