Frequent sneezing may be due to allergic rhinitis, upper respiratory tract infections, etc. It may also be due to environmental dust stimulation, etc., so there are hazards to health. 1. Allergic rhinitis: sneezing occurs when patients are exposed to allergens (pollen, dust mites, etc.), with or without nasal congestion, runny nose and other symptoms, which may induce respiratory diseases, such as trachea-bronchial inflammation, asthma and so on, for a long time. 2. Upper respiratory tract infection: patients with recurring colds will also have the symptom of frequent sneezing, which may be accompanied by coughing, sore throat and other discomforts, and untimely treatment may lead to lower respiratory tract inflammation such as lower bronchitis and pneumonia. Frequent sneezing may be caused by pathological factors, so it needs to be taken seriously, and it is recommended to consult a doctor in time to clarify the specific causes of the disease.