Your kidneys remove waste and fluid from your blood to make urine. Sometimes, when you have too much of certain wastes and not enough fluid in your blood, these wastes can build up and stick together in your kidneys. These clumps of waste are called kidney stones.
Anyone can get a kidney stone, but some people are more likely than others to have them. Men get kidney stones more often than women do. You may also be more likely to have kidney stones if:
A small kidney stone that moves easily through the urinary tract, do not cause any symptoms and can remain unnoticed.
A larger kidney stone can cause the following symptoms: