A kidney stone that has penetrated through the urinary tract (possibly with pain) into the bladder is relatively small, and it is likely excreted from the body along with the urine.
However, the stones formed in the bladder are usually larger than the kidney stones, so they often remain in the bladder. These stones can cause unpleasant symptoms, such as frequent urination, painful urination, and blood in urine (hematuria). Today, bladder stones are a rare disorder, which becomes even rarer, although the reason for that are uknown.
If you have bladder stones that are too large to go through the urethra naturally, they should be removed. In some cases, this can be achieved by inserting a cystoscope (under the general anesthesia) through the urethra into the bladder.
In this case, the cystoscope is equipped with a special device for removing or crushing the stones into small pieces that will be ”flushed out” with the urine. The bladder can also be cut and opened in order to reach the stone. Stones can sometimes be turned into dust with high frequency ultrasound waves, after which they are easily excreted with the urine.