The common clinical causes of itchy nose are cold, allergic rhinitis, eczema, etc. The most common causes of itchy nose are cold, allergic rhinitis and eczema. 1. Cold and flu: this is the most common cause of itching on both sides of the nose, which is usually due to the decline in body resistance, pathogens invasion caused by the nasal mucosa will be stimulated by the nasal mucosa sensitivity increases, thus leading to itchy nose on both sides. 2. Allergic rhinitis: the disease is usually associated with the nasal mucosa by external dust, pollen, dust mites and other factors of stimulation, clinical manifestations of sneezing, runny nose, nasal itching, nasal congestion and so on. Among the sick people in the onset of itchy nose is mainly related to the nasal mucous membrane allergic reaction, the mucous membrane around the nerve cells are stimulated by inflammation and related symptoms. 3. Eczema: this disease is usually associated with autoimmune abnormalities, the symptoms of which, in addition to the rash, there is intense itching in the affected area, yellowish ooze. If the above conditions exist, it is recommended to consult a doctor in time for a clear diagnosis and further treatment.