Skip to main content
AARP Optum logo

Kidney Infection (Pyelonephritis)


A kidney infection is also known as pyelonephritis or an upper urinary tract infection (UTI). With this, germs get into your urinary tract and move up to one or both of your kidneys. Your kidneys, ureters, bladder, and urethra make up your urinary tract. The urethra is a tube at the bottom of the bladder. Urine flows out of the body through this tube. The germs can sometimes enter the urethra and then spread in the bladder. The ureters are small tubes that join the bladder and the kidneys. A bladder infection is when the lower urinary tract is infected. A kidney infection is when this infection spreads into the kidney through the ureters.

Popular drugs
5 popular Kidney Infection (Pyelonephritis) drugs