Itchy nostrils may be caused by nasal vestibular eczema, acute rhinitis, vasomotor rhinitis and chronic nasal vestibulitis, or allergic rhinitis. 1. Nasal vestibular eczema: it is a skin damage disease that occurs in the nasal vestibule. The affected area is itchy and the skin is rough and scaly. If it is the acute stage of nasal vestibular eczema, there is often localized oozing; if it is chronic nasal vestibular eczema, there can be thickening and roughness of the nasal vestibular skin and other manifestations. 2. Acute rhinitis: it is an acute inflammatory disease of the nasal mucosa caused by viral infection, which is susceptible to seasonal changes and is common in winter. Initially, there may be itching, dryness, burning sensation in the nose or accompanied by other systemic symptoms. 3. Vasomotor rhinitis: also known as vasodilatory rhinitis, there is no clear allergens to non-specific stimulus-induced neurotransmitter-mediated neurogenic inflammation of the nasal mucosa. It is characterized by nasal itching, sneezing, nasal congestion and runny nose. 4. Chronic nasal vestibulitis: diffuse inflammation of the nasal vestibular skin, often manifested as itching of the nasal vestibular skin, especially the lateral part of the nasal vestibule and the front of the nostrils is more obvious, can be unilateral or bilateral, accompanied by dryness, burning and foreign body sensation and other symptoms. 5. Allergic rhinitis: this disease is related to contact with allergens, such as dust, mites, pollen, fungi, animal dander, feathers, insects, etc.; seasonal itchy nose is often associated with some plants, such as elm, poplar, willow and so on. Itchy nostrils may also be other reasons, you should go to the hospital in a timely manner to find out the cause of the disease, and actively treat it, so as not to delay the condition.