Sneezing and itchy nose may be caused by allergic rhinitis, or it may be caused by colds, vasomotor rhinitis and other diseases. 1. Allergic rhinitis: a chronic reactive inflammation of the nasal mucosa due to an allergic reaction after exposure to allergens. Common allergens include certain foods, medicines, pollen, dust and cold air, etc. Allergens stimulate the nasal mucosa, resulting in paroxysmal sneezing, itchy nose and nasal congestion. 2. Cold: due to the decline in body resistance, viruses and bacteria invade the human body, causing acute inflammation of the nasal mucosa, viral infection is the most common, occurring in winter and spring seasons, the performance of sneezing, runny nose, itchy nose, nasal congestion, but also sore eyes, dry throat, headache, sore throat, cough and other symptoms, the course of the disease is usually in a week or so. 3. Vasomotor rhinitis: this disease is mainly caused by dysfunction of the autonomic nervous system, men and women can develop, usually occurring in young and middle-aged women, environmental factors such as temperature, air pressure, irritating gases can stimulate nasal symptoms. Nasal congestion, runny nose, sneezing, sneezing, itchy nose, etc. are more common. Sneezing and itchy nose and other factors, should be timely to the regular hospital otolaryngology outpatient clinic, under the guidance of the doctor, do not self-diagnosis and medication, in order to avoid delaying the condition, resulting in serious adverse consequences.