Word! Kidney Stones
Your two kidneys (say: KID-nees) work hard to keep stuff you don't need out of your blood. That waste is combined with water to make your pee.
But sometimes the stuff in your pee (like calcium) can make little crystals that build up to become hard stones. Depending on the size, these kidney stones can be painful, cause blood in the urine, and block pee from coming out of the kidney.
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2018 KidsHealth ® All rights reserved. Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com