Tendinitis is inflammation or irritation of a tendon — the thick fibrous cords that attach muscle to bone. The condition causes pain and tenderness just outside a joint.
While tendinitis can occur in any of your tendons, it’s most common around your shoulders, elbows, wrists, knees and heels.
Most cases of tendinitis can be successfully treated with rest, physical therapy and medications to reduce pain. If tendinitis is severe and leads to the rupture of a tendon, you may need surgery.