Achilles bursitis, also known as retrocalcaneal bursitis, is a common condition in athletes. The major cause of Achilles bursitis is overuse, most likely from too much walking, running or jumping. It's no wonder that Achilles bursitis is especially common in athletes. A sudden increase in activity level without proper conditioning can increase a patient's risk for Achilles bursitis. The most common symptom of Achilles bursitis is pain at the back of the heel, especially when running uphill or on soft surfaces such as sand. Pain may get worse when standing on tiptoes. The area may also feel tender when touched, and some patients report that the heel may feel "spongy". Some swelling may also be observed.