Urinary stones are deposits of salts and minerals inside the kidneys or ureters, bladder, urethra. Urinary stones can be found in the urinary tract from the kidneys to the ureters (the tube connecting the kidneys to the bladder) and stones in the bladder, sometimes flowing out to the urethra. In hot and humid tropical countries like Vietnam, urinary stones are very common. However, very few people can recognize the pain caused by urinary stones.