Nasal itching is commonly associated with allergic rhinitis, but can also be seen in acute and chronic rhinitis, etc.
Itchy nose causes sneezing as a reflexive protective action in humans. The nasal mucous membrane nerves produce a sequential sharp deep inhalation after exposure to dust, allergenic pollen, irritating odours, cold stimuli on the body surface, etc., and a strong unconscious airflow ejects rapidly from the nasal and oral cavities to clear the nasal cavity of foreign objects or irritants, etc.
Repeated and frequent episodes of sneezing are a pathological phenomenon and an important symptom of certain nasal diseases.