The Achilles tendon is the largest tendon in your body. It stretches from the bones of your heel to your calf muscles. You can feel it — a springy band of tissue at the back of your ankle and above your heel. It lets you point your toes toward the floor and raise up on your tiptoes.
It’s common for this tendon to get injured. It can be mild or moderate and feel like a burning pain or stiffness in that part of your leg. If the pain is severe, your Achilles tendon may be partly torn or completely ruptured.