Frequent sneezing is not a harbinger of any disease. Frequent sneezing may be caused by colds, irritation from foreign objects, allergic rhinitis and other reasons. 1. Colds: Colds are usually caused by viral infections and other reasons, and the symptoms of sneezing will appear in the early stage, and some people will also be accompanied by nasal congestion and runny nose. 2. Stimulation by foreign objects: the mucous membrane of human nasal cavity is relatively sensitive, when the nasal cavity is stimulated by smoke, dust, pollen, irritating odors and other undesirable stimuli will lead to frequent sneezing symptoms. 3. Allergic rhinitis: allergic rhinitis is a non-infectious disease of the nasal mucosa, which can lead to itchy nose after being stimulated by the outside world, and thus frequent sneezing. Frequent sneezing may also be seen in nasal vestibular eczema and other diseases, it is recommended to go to the hospital to clarify the cause of the disease and then under the guidance of the doctor for treatment.