Bladder

Skip Navigation
Female urinary tract, showing kidneys, ureters, bladder, and urethra in lower back and abdomen, with detail of ureter going into bladder and urethra going out of bladder.

The bladder is a balloon-shaped muscle that stores urine. It is part of the urinary tract, along with the kidneys, ureters, and the urethra.

The kidneys filter waste products and water from the blood to form urine. The urine moves from the kidneys through tubes called ureters to the bladder, where the urine is stored. From the bladder, urine leaves the body through another thin tube, the urethra.

Current as of: June 16, 2022

Author: Healthwise Staff
Medical Review:
E. Gregory Thompson MD - Internal Medicine
Adam Husney MD - Family Medicine
Avery L. Seifert MD - Urology




The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.