Bladder stones develop when the minerals in concentrated urine crystallize and form stones. This often happens when you have trouble completely emptying your bladder. Bladder stones may be related to stones that have formed in other parts of the urinary tract, such as the kidneys.
Both men and women can develop bladder stones. Children can get stones, but this is rare in developed countries. The risk is higher for people who are paralyzed, who have had bladder augmentation, or who have bladder outlet obstruction.
Small bladder stones may pass without treatment, but sometimes bladder stones need medications or surgery. Left untreated, bladder stones may lead to infections and other complications.