Acute cystitis is inflammation of the bladder. It is usually caused by an infection. There are two types are of acute cystitis:

  • Uncomplicated—Premenopausal, nonpregnant women, and in people with no other underlying conditions
  • Complicated—Underlying conditions are present.

The Urinary Tract
The Urinary Tract
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Acute cystitis is most often caused by bacteria. Bacteria enter the urethra and travel into the bladder. The urethra is a tube that allows urine to pass from the bladder to the outside. Bacteria may come from the lower intestines, the rectal area, or skin.