Why does my Achilles tendon hurt?Suffering from stiffness or pain on or above the heel? If so, you are probably struggling with an Achilles tendon injury . In this blog, you will find the main causes and symptoms. The Achilles tendon connects the strength of the calf muscle to that of the heel bone, and is one of the largest and strongest tendons in the human body. This tendon allows you to push off from the ground when walking, running or jumping. When the tendon is overused, it can result in an Achilles tendon injury. Especially when changeable movements are made with the muscle, for example by suddenly running or jumping a lot. Therefore, the injury is also most common in runners and athletes who make intense movements and/or jumps. The best-known causes are listed here for you: