Reciprocal nasal congestion-decongestion reflex.
D000485:Allergens; D006801:Humans; D006969:Hypersensitivity, Immediate; D014663:Nasal Decongestants / Q000494:pharmacology; D009666:Nose / Q000502:physiology*; D010919:Placebos; D011058:Pollen; D012018:Reflex / Q000187:drug effects / Q000502:physiology*; D006255:Rhinitis, Allergic, Seasonal
D000485:Allergens; D014663:Nasal Decongestants; D010919:Placebos