The most common diseases that also cause nostril itching and sneezing symptoms are acute rhinitis, allergic rhinitis, and vasomotor rhinitis.
In general, you can first wash your nasal cavity with saline or sea salt water; if the climate is dry, you can also steam your nasal cavity with warm water and wear a mask when you go out.
After the above situation treatment, the nasal cavity is still itchy, you need to further consult a doctor to clarify the cause of the disease.