The best way to prevent bladder stones is to treat problems that cause blockage of urine flow out of the bladder promptly. Treatment for urinary tract infections and avoidance of dehydration may prevent some cases. Urinary catheters and other foreign objects should be removed, or at least changed often.
Bladder stones usually do not cause long-term effects but can lead to urinary tract infections and pain if untreated.
Bladder stones are not contagious, and pose no risk to others.