Tendonitis is a condition of the foot which in plain and simple word leads to inflammation of the tendon. Tendons are thick groups of cord which help connect the bone to the muscles. Because of various reasons the tendons become inflamed. There are many types of tendons in the body and Achilles tendon is situated in the feet. It is caused because of injury or overuse. It can affect any tendons of the feet. They are also referred to as Achilles tendonitis or extensor tendonitis. Usually this problem is self curing and with proper massage, rest and treatments it could get completely cured in two to three months. However in many chronic cases cure may require using of special shoes.