What is (are) Urinary Tract Infections ?
Urinary tract infections (UTI) are a common bladder problem, especially as people age. UTIs are the second most common type of infection in the body. Each year, UTIs cause more than 8 million visits to health care providers. UTIs can happen anywhere in the urinary system (which includes the kidneys, bladder, and urethra). But UTIs are most common in the bladder. A UTI in the bladder is called cystitis. Infections in the bladder can spread to the kidneys. A UTI in the kidneys is called pyelonephritis. Sometimes, a UTI can also develop in the urethra, but this is less common. A UTI in the urethra is called urethritis. Learn more about urinary tract infections in adults.