Thanks for your question. If I don't respond to you immediately, it is because I am busy with a patient. I WILL get back to you ASAP.
If you saw crystals in the urine, this may be a sign of an underlying kidney stone or even bladder stone as the source. These stones can cause you to have overactive bladder symptoms. I recommend you get in to see your doctor or a urologist for an exam and they should consider doing a CT scan to rule out any stones that may need to be removed. Hope this helps.
Removeal may be done by minimially invasive surgery called ureteroscopy. Sometimes, shockwaves can be done to remove then. It all depends on where the stone is located and how large it is.
Prevention of stones is mainly done through hydration with water. But your doctor will need to do further lab testing to see what the stone is made of so that the appropriate medication can be prescribed if needed.