Inflammation of both the bladder and the urethra (the tube through which urine exits the body).
From Greek 'kystis' (bladder) + 'urethra' (urine tube) + '-itis' (inflammation). Standard medical terminology combining anatomical names with inflammation suffix.
Most urinary tract infections are actually cystourethritis—both the bladder and urethra are inflamed, which is why you get that burning sensation and urgency to urinate.
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