If you want a wart on your face removed and you don't want to risk scarring by doing it yourself. If you have a wart that does not respond to home treatment, particularly if it bleeds or changes color. The kidneys filter waste products out of the blood and mix them with water to make urine. Stones that form in the kidneys must pass through one of the tubes, or ureters, that connect the kidneys to the bladder. From there, the stones can pass out of the body with the urine.
Some stones pose no problem.
However, most stones cause excruciating pain as they move from the kidneys to the bladder. This journey can take a few hours, or it can last for several days. Fortunately, the pain and other symptoms go away once the stone is passed. Sometimes a stone gets trapped in one of the tubes leading to the bladder, blocking the flow of urine. Doctors can often destroy such stones with bursts of shock waves, turning them into powder that is then easily washed out with the urine.