Calcific periarthritis Learn about calcific periarthritis (a calcium crystal disease causing joint swelling) - including symptoms, causes, diagnosis, effects and treatments. Carpal tunnel syndrome Carpal tunnel syndrome causes pain or aching and tingling or numbness in your hand. Learn about the causes, symptoms and treatments. Complex regional pain syndrome (CRPS) Complex regional pain syndrome (CRPS) causes persistent pain in an arm or a leg. Learn about the causes, symptoms and treatment. Cryoglobulin-associated vasculitis Learn about cryoglobulin-associated vasculitis - a small-vessel vasculitis associated with cryoglobulins that can reduce the flow of blood or block vessels.