Inflammation of your bursa powering the heel is called Retrocalcaneal Bursitis. Repetitive tension or friction about the back from the heel triggers the bursa to swell causing heel pain and tenderness, swelling and ankle stiffness. Frequently associated with Achilles Tendonitis and Haglunds Deformity.   Likely Causes of Ankle Pain Ankle pain https://www.theorthopaedicandpainpractice.com/the-definitive-guide-to-diagnosing-and-treating-ankle-pain-in-singapore/