Achillodynia is a pain syndrome of the Achilles tendon, the tendon that connects the musculature of the calf to the calcaneus bone, and is caused by overstraining of the tendon. It is an inflammatory reaction to a mechanical injury of the tendon through micro-trauma and is very common. Changes to tendon tissue are generally found around 2-6 cm above the calcaneus bone but may also occur at the bony attachment of the tendon. Patients complain of strong acute or chronic pain around the Achilles tendon with thickening in some areas.