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Health A-Z

What Is an Achilles Tendon Injury?

An Achilles tendon injury can happen to anyone, whether you’re an athlete or just going about your everyday life.

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 or completely torn.

Achilles tendinitis is another type of injury in which some part of your tendon is inflamed. There are two main types of this condition, which affect different parts of your tendon:

  • Noninsertional Achilles tendinitis. Fibers in the middle of your tendon break down, swell, and get thick.
  • Insertional Achilles tendinitis. This affects the lower part of your heel, where your tendon inserts, or goes into, your heel bone. It can cause bone spurs.