** Thanks for contacting with your health concern 1. whenever we use the use [for any reason] its the cushion of cartilage which prevents friction as the hip bone moves into the socket, so with repetitive use the cartilage can wear down or become damaged, so consult an orthopedic surgeon to exclude conditions like - repetitive stress injury - hip osteoarthritis, bursitis, tendinitis,AVN [avascular necrosis], DVT [deep vein thrombosis], PVD [peripheral vascular disorder] PS. The symptoms have to be carefully assessed by your doctor to ensure that whether it requires immediate medical attention or long-term therapy.