Achilles tendonitis occurs when the Achilles tendon is repeatedly stretched by force, so athletes in track and field, high jump and long jump or fans of basketball and football are at high risk of this disease. In addition, there are many factors in life that can increase the risk of developing Achilles tendonitis, commonly including sudden increases in training intensity, inappropriate training styles, inadequate preparation activities, ill-fitting shoes, flat feet, and the use of quinolone antibiotics.