Retrocalcaneal bursitis happens when the bursae around
your heel become inflamed. Bursae are fluid-filled sacs that form around your
joints. The bursae near your heels are behind your Achilles tendon, right
above where it attaches to your heel bone.
Overuse from walking, running, or jumping can all cause
retrocalcaneal bursitis. It’s common in athletes, especially runners and ballet
dancers. Doctors sometimes misdiagnose it as Achilles tendonitis, but the
two conditions can happen at the same time.