Urine contains a large number of different chemicals. Under some circumstances, these chemicals may solidify into salt crystals. This is called crystalluria. Crystals can be found in the urine of ...

Calcium oxalate crystals in the urine are the most common cause of kidney stones. Learn where they come from, how to prevent them, and how to remove them.

If the crystals do not form into stones, or if the stones are small enough, they will pass out of a person’s body in their urine. Smaller stones may or may not cause symptoms and are unlikely to ...