Causes, incidence, and risk factors
are common. Some types run in
families. They often occur in
There are different types of kidney stones. The exact cause depends on the type of stone.
Stones can form when urine contains too much of certain substances. These substances can create small crystals that become stones. The stones take weeks or months to form.
•Calcium stones are most common. They are more common in men between age 20-30.