These are small, hard crystals that form in your urine and can become trapped in your bladder. ... Now that you've seen the urine color chart, check out what happens if you hold in pee.

Learn what urine tests can reveal about your health, what things they can check for, and what normal and abnormal ranges are and what they indicate.

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.