Tendonitis occurs when the tendons become inflamed or irritated. Click here to learn more about what causes tendonitis and how it’s diagnosed and treated. Tendinitis is inflammation or irritation of a tendon that causes pain and tenderness around joints like the shoulder, elbow, wrist, or knee. Tendonitis - an easy to understand guide covering causes, diagnosis, symptoms, treatment and prevention plus additional in depth medical information. Tendonitis is an inflammation of a tendon—the tough cord of tissue that connects muscles to bones. Tendonitis can affect any tendon, but is most commonly seen in the wrist and fingers. Find out more about tendonitis, where a tendon becomes swollen. It can cause joint pain and stiffness. Tendinitis is inflammation of the tendons, which are the tapered ends of muscles that attach to bones. Tendons are in action every time muscles contract and bones move. As such, tendonitis is often the result of overuse, such as repetitive. Tendonitis (tendinitis) is a condition where the connective tissues between your muscles and bones (tendons) inflame. Often caused by repetitive activities, tendonitis can be painful. It can happen in your elbow, knee, shoulder, hip, Achilles tendon and base of your thumb. Rest and avoiding strenuous activities help tendons heal. Learn how repetitive stress injuries cause tendonitis, the common symptoms, and treatment options to ease pain and restore function. Overview Tendinitis is new or sudden swelling and irritation, called inflammation, of a tendon. Tendons are thick fibrous cords that attach muscle to bone. Tendinitis causes pain and tenderness just outside a joint. Tendinitis can happen in any tendon. It's common around shoulders, elbows, wrists, hips, knees and heels. Tendinitis is sometimes called tendinopathy. Tendinopathy is an umbrella. Tendinitis is the inflammation of a tendon caused by repetitive overuse or injury. Treatments include rest, ice, and pain medications.