Other Names Include: Achilles tendonitis, achilles tendinitis, achilles tendon pain, achilles tendinosis, achilles tendinopathy. Achilles Tendonitis is a term that commonly refers to an inflammation of the Achilles tendon or its covering. It is an overuse injury that is common especially to joggers and jumpers, due to the repetitive action and so may occur in other activities that requires the same repetitive action. Most experts now use the term Achilles tendinopathy to include both inflammation and micro-tears. But many doctors may still use the term tendonitis out of habit. What Causes Tendon Pain? Tendons are the tough fibres that connect muscle to bone. Most tendon injuries occur near joints, such as the