Tendinitis, also known as tendonitis, is the inflammation of a tendon. Tendinitis is a type of tendinopathy - a disease of the tendon. Tendinosis is similar to tendinitis, but requires different treatment. Tendinitis refers to larger-scale acute (sudden, short-term) injuries with inflammation.
Usually tendinitis is referred to by the body part involved, for example, Achilles tendinitis which affects the Achilles tendon, or patellar tendinitis which affects the patellar tendon (jumper's knee). Tendinitis can occur in various other parts of the body, including the elbow, wrist, finger, or thigh. It is caused by overusing a tendon or injuring it, as may happen during sport.
Tendinitis can affect people of any age, but is more common among adults who do a lot of sports. Elderly individuals are also susceptible to tendinitis because our tendons tend to lose their elasticity and become weaker as we get older.
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