Inflammation in the bursa behind the heel is called Retrocalcaneal Bursitis. Repetitive tension or friction around the again on the heel will cause the bursa to swell leading to heel pain and tenderness, swelling and ankle stiffness. Typically connected to Achilles Tendonitis and Haglunds Deformity.   Health and fitness's content is https://www.theorthopaedicandpainpractice.com/the-definitive-guide-to-diagnosing-and-treating-ankle-pain-in-singapore/