What is achilles tendonitis?
Your Achilles tendon, located at the back of the ankle, connects the calf muscle to the heel bone of the foot and helps you to extend your foot and pint your toes and to achieve the "push" off of the foot. When the long tendon connecting the calf muscle to the back of the heel gets overstretched, irritated or torn, this is called an Achilles Tendon injury. Sudden jumping or planting of the foot can cause an injury, or it can occur from chronic repetitive damage or tendonitis. The pain is described as being "shot in the heel" when the tear occurs, or as a feeling of a "pop" or "explosion" when the tendon ruptures. There is usually swelling and a defect in the tendon, as well as a weakness in the foot with the tear.
Chronic repetitive damage from Achilles tendonitis is a fairly common overuse injury resulting in noticeable inflammation and irritation that may eventually lead to pain and swelling, and also to tears within the tendon. The tears make the tendon susceptible to rupture.
In a severe Achilles tendon injury, there is too much force on the tendon and it can partially tear or rupture completely. This can happen suddenly and be quite painful, and affects professional athletes, as well as amateur or "weekend warriors".