5.7mm stone in my urinary bladder?

Here are some ... A 5.7-mm bladder stone may not be easy or possible to pass out of your urethra. Tou may give 1-2 weeks of time to try; if hurting in passing it or never passed, proceed with procedural removal. So, removing it with procedures would be more realistic and practical. Ask Doc timely for details.
Probably came from. The kidney - so the hard part is over. You may well pass it, but no consequence if it stays there.

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I have 5.5mm stone in urinary bladder. Can it be cured without surgery?

Possibly. A stone that size may pass without surgery. If it does, you will definitely feel it pass. Lithotripsy could be tried to break it up but it is simple to remove it with surgery. Read more...