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.
Tendinitis may be caused by strain, overuse, injury, or too much exercise. Tendonitis may also be related to a disease such as diabetes, rheumatoid arthritis, or infection.
Avoiding activities, resting the injured area, Icing the area the day of the injury are the basic treatment of tendinitis.