in women with cervicitis (inflammation of the cervix) or vaginitis (inflammation of the vagina) and in young men with uti symptoms, a "chlamydia trachomatis" or "neisseria gonorrheae" infection may be the cause. vaginitis may also be due to a yeast infection. interstitial cystitis (chronic pain in the bladder) can be the cause for people who have uti symptoms many times, but whose urine cultures remain negative and do not improved with antibiotics. prostatitis (inflammation of the prostate) may also be considered in the differential diagnosis.