nonspecific urethritis (NSU) [L, non, not, species, form] , inflammation of the urethra of unknown origin. Onset of symptoms is often related to sexual intercourse. The acute phase of NSU is seldom seen in women, but the chronic phase is a common urological difficulty among women. The condition is noted by urethral discharge in men and by reddening of the urethral mucosa in women. Treatment with antibiotics is not always successful. See also nongonococcal urethritis.
