Trichomonas vaginitis is often caused by an infection with Trichomonas vaginalis and generally does not heal spontaneously without treatment. Moreover, the trichomonads causing trichomonas vaginitis can also be present in the urinary system, i.e., they can appear in the urethra. Therefore, after diagnosing trichomonas vaginitis, it is usually not recommended to use local medications, i.e., medications applied only in the vagina, but rather to use systemic medications. This is because trichomonads may be present in locations other than the vagina. If only local vaginal medications are used, it might lead to the situation where, even if the vaginal infection is cured, trichomonas vaginitis could be reinfected from the urethra, leading to a recurrence. Hence, once diagnosed with trichomonas vaginitis, it is recommended to treat it, and oral medication is advised.