Kidney Stone Center at The Miriam Hospital Q/A 1
Learn about the causes and symptoms of kidney stones.
A kidney stone is a solid piece of material that forms from crystallization of substances in the urine. The stone may remain in the kidney or break loose and travel down the urinary tract.
A small stone may pass through the body, but a larger stone can get stuck in a ureter, the bladder or the urethra. This may block the flow of urine and cause great pain.
A kidney stone may be as small as a grain of sand or as large as a pearl, and some are as big as golf balls.
Approximately 12 to 14 percent of people in the United States have a type of urinary stone. Conditions that may increase the chance of developing kidney stones include:
The symptoms of kidney stones may resemble other conditions or medical problems. Always consult your physician to determine the cause of any of these symptoms.
Calcium stones are the most common type of stones. Calcium is a normal part of a healthy diet and is used by bones and muscles.
Calcium not used by the body goes to the kidneys where it is normally flushed out in urine. In some people, however, the calcium that stays behind joins with other waste products to form a stone.
Struvite stones are a type of stone that contains the mineral magnesium and the waste product ammonia. It may form after an infection in the urinary system.
Uric acid stones may form when there is too much acid in the urine.
Cystine stones are made up of cystine, a building block for muscles, nerves and other parts of the body. Cystine can build up in the urine and form a stone. Cystine stones are rare and often run in families.
Learn about the causes and symptoms of kidney stones.