Bladder stones are hard masses of minerals in your bladder. Bladder stones develop when the minerals in concentrated urine crystallize. This often happens when you can't completely empty your bladder.
Signs and symptoms can vary from severe abdominal pain to blood in your urine. Sometimes, bladder stones don't cause any symptoms.
Small bladder stones may pass without treatment, but some need medications or surgery. Left untreated, bladder stones may lead to infections and other complications.