Stones form in the kid­neys and can move in­to the kid­ney tubes called the ureters. They can cause se­vere pain. The pain usu­al­ly starts in the back and can move as the stone moves. It can be felt in the tum­my. The pain is col­icky and comes and goes – dur­ing episodes pa­tients of­ten say that ly­ing still does not help and de­scribe pac­ing while try­ing to cope. There may be blood in the urine, vom­it­ing and even ur­gency to go to the bath­room. A blocked kid­ney may lead to in­fec­tion and even loss of a kid­ney if not dealt with in time.