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- The kidneys are a pair of small organs that lie on either side of the spine at about waist level. They have several important functions in the body, including removing waste and excess water from the blood and eliminating them as urine. These functions make them important in the regulation of blood pressure. Kidneys are also very sensitive to changes in blood sugar levels and blood pressure and electrolyte balance. Both diabetes and hypertension can cause damage to these organs.
- Two ureters, narrow tubes about 10 inches long, drain urine from each kidney into the bladder.
- The bladder is a small saclike organ that collects and stores urine. When the urine reaches a certain level in the bladder, we experience the sensation that we have to void, then the muscle lining the bladder can be voluntarily contracted to expel the urine.
- The urethra is a small tube connecting the bladder with the outside of the body. A muscle called the urinary sphincter, located at the junction of the bladder and the urethra, must relax at the same time the bladder contracts to expel urine.
Any part of this system can become infected. As a rule, the farther up in the urinary tract the infection is located, the more serious it is.
Bladder infection is a specific type of urinary tract infection
Cystitis is inflammation of the bladder. Most cystitis is from bacterial infections involving the bladder and less commonly may be the result of yeast infections, viral infections, chemical irritants of the bladder, or for unknown reasons (interstitial cystitis). Bladder infection (infectious cystitis) is a type of urinary tract infection (UTI). This review will specifically address infectious cystitis.
The urine in the bladder is normally free of bacteria (sterile). However, bacteria may be present in the bladder but not cause inflammation or symptoms of an infection. This is called asymptomatic bacteriuria and is not cystitis.
Cystitis can be complicated or uncomplicated. Uncomplicated cystitis is a bladder infection in a healthy person with a structurally and functionally normal urinary tract. A complicated bladder infection is one that occurs in association with factors that increase the chance of developing a bacterial infection and decrease the chance of antibiotic therapy being effective. Such abnormalities include obstruction from stones, congenital blockages, urethral strictures, and prostate enlargement.
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