The nose is super itchy for no reason, mainly considered to be related to infection, allergy, chemical factors, cold and other factors. 1. Infection: Bacterial and viral infections can cause acute rhinitis, nasal vestibulitis and other diseases, which can lead to itchy nose. 2. Allergy: such as mites, pollen, hair mold and other allergies, can also trigger the nose itchy. 3. Chemical factors: such as inhalation of irritating odors, such as ammonia, ammonia, and acidic or alkaline dust, stimulate the nasal mucosa, is also one of the important triggers of nose itching. 4. Cold: the body’s lower limbs and body surface cold, can be reflexively caused by the nasal mucosa vasoconstriction, and then the phenomenon of nasal itch. 5. Other factors: such as nasal tuberculosis, nasal eczema, etc., can also trigger nasal itching. The causes of this phenomenon are complex. If this phenomenon persists, it is recommended to consult a doctor as soon as possible, to clarify the cause of the disease, and under the guidance of the doctor for treatment.