Achilles tendonitis is a condition of irritation and inflammation of the large tendon in the back of the ankle. Achilles tendonitis is a common overuse injury that tends to occur in recreational athletes. The overuse causes inflammation that can lead to pain and swelling. Furthermore, Achilles tendonitis can lead to small tears within the tendon, and make it susceptible to rupture.

Achilles tendonitis is a soreness and stiffness that comes on gradually and continues to worsen until treated. It often starts with stiffness and creaking when first getting out of bed in the morning. Lightly pinching the Achilles tendon with the forefinger and thumb will indicate soreness. It comes on suddenly, sometimes with a popping sound, and is debilitating.

Correct footwear can be one of the keys to preventing, recovering from, and preventing the reoccurrence of, Achilles tendon injuries.