The phenomenon of frequent sneezing and running nose may be vasomotor rhinitis, or it may be cold and allergic rhinitis. 1. Vasomotor rhinitis: some people have stress allergic reaction due to dry weather, which may lead to frequent sneezing and running nose. 2. Cold and flu: acute upper respiratory tract infection caused by viruses, due to increased nasal secretions and stimulation of the mucous membrane of the upper respiratory tract, which may lead to frequent sneezing and runny nose. 3. Allergic rhinitis: a kind of non-infectious inflammatory disease of the nasal mucosa, due to contact with certain allergens and lead to the body to appear frequent sneezing, runny nose, accompanied by nasal itching and nasal congestion and other phenomena. There are many other causes of frequent sneezing and runny nose, it is recommended to identify the cause of the disease and take corresponding treatment measures to avoid blindly using their own medication.