Nose always itchy may be related to dry air, nasal diseases, allergies and so on. If the nose is itchy, exclude physiological reasons, should be timely hospital consultation, systematic examination by a specialist doctor to clarify the diagnosis and causes, do not take medication privately, so as not to delay the condition. 1. Dry air: when the air is too dry, the dry crust produced by the nasal secretion will adhere to the surface of the nasal mucosa, thus producing a certain stimulation of the nasal mucosa, resulting in an itchy nose. 2. Nasal diseases: If you suffer from rhinitis, sinusitis and other diseases, the nasal mucosa will be stimulated by germs or viruses, resulting in itching. 3. Allergy: contact with animal dander, dust, air pollen and other allergic substances, can also lead to itchy nose, such people are often accompanied by a history of allergies with allergic rhinitis is high, you need to try to avoid contact with allergens, so as to avoid the nose itchy.