Bladder stones are hard lumps of minerals that gradually form inside the bladder, usually as a result of incomplete emptying of the bladder (urinary retention).
They are also more likely to develop in people who have recurrent cystitis (inflammation of the bladder) or certain disorders of body chemistry, such as gout .
A small stone may not cause any symptoms and may be passed out naturally in the urine.
A large stone may cause pain and difficulty passing urine, a frequent and sometimes urgent need to pass urine, and blood in the urine. Treatment is usually with surgery
