What does "cystitis" mean in medical terminology?

Cystitis means inflammation of the urinary bladder, from cyst meaning bladder or sac and itis meaning inflammation. The most common cause is bacterial infection ascending from the urethra, making it a type of urinary tract infection. Symptoms include dysuria meaning painful urination, urinary frequency and urgency, suprapubic pain, and cloudy or foul-smelling urine. Interstitial cystitis is a chronic noninfectious form causing bladder pain and pressure.