maybe a car accident, or you hit your
hip on a sharp, hard corner or you fell on your
hip... it is inflammation of the fluid-filled sac (bursa) that lies between a tendon and skin, or between a tendon and bone... so RA or osteoarthritis can increase your risk of development... I had it on my leg after a car accident and after physical therapy for it I finally got through it... the bursa was absorbed by my body is what the doctor told me... it hurt like fire burns!