Customer (name blocked for privacy),
The most common cause is by injury or overuse of the tendon. Symptoms can include pain, tenderness, and mild swelling. Treatment can entail surgery, corticosteroid injections, physical therapy, and strenghtening exercises. It can recur, but is preventable. You can read more info here
http://www.nlm.nih.gov/medlineplus/ency/article/001229.htm
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