Your Achilles tendon is the biggest, strongest tendon in your body, but that doesn’t make it immune to problems, especially since it’s working with every step you take. Like most other tendons and muscles, your Achilles tendon is prone to inflammation due to overuse, particularly when there’s a sudden increase in repetitive activities involving your feet. And, of course, this kind of ongoing stress can lead to an injury of your tendon fibers.Â