An immediate sharp pain in the back of your ankle and lower leg that makes it impossible to walk properly. It almost feels like you've been kicked, or even shot.
These are the sensations typical of an Achilles tendon rupture. The Achilles tendon is a large, strong fibrous cord that connects the muscles in the back of your lower leg to your heel bone.
If you overstretch your Achilles tendon, it can tear (rupture). An Achilles tendon rupture can be partial or complete. Usually an Achilles tendon rupture occurs just above your heel bone, but it can happen anywhere along the tendon.
Signs and symptoms of an Achilles tendon rupture include:
Pain, possibly severe, and swelling near your heel
An inability to bend your foot downward or walk normally
An inability to rise on your toes on the injured leg, if you've ruptured the tendon completely.