The Achilles tendon is the largest one in your body and is vital for any movement especially that needed in athletic activities. This tendon is prone to injury, often from overuse. Symptoms include pain, swelling and irritation. Doctors use a wide range of nonsurgical treatments for this condition: rest, icing, medications, physical therapy, injections, supportive shoes and various exercises. Persistent Achilles tendonitis may call for surgery. The specific type of procedure depends on the location, nature and severity of the tendonitis.