A method for treating at least one of neuro-olfactory triggered illnesses, and related conditions within a subject is provided. The method includes the steps of: a) providing a composition that includes one or more agents adapted to induce a level of anosmia/hyposmia in the subject, which level of anosmia/hyposmia is sufficient to substantially decrease olfactory sensory stimulation within the subject and a neurologic response to the stimulation that is one or both of triggering and aggravating the illness or condition； and b) applying the composition to a nasopharynx region of the subject.
