Frequent sneezing in colds may be associated with upper respiratory tract infection, allergic rhinitis, acute infectious disease precursor symptoms and other reasons. 1. Frequent sneezing during colds is due to upper respiratory tract viral infection attacking the nasal cavity, causing increased nasal secretions, stimulating the nasal mucosa causing sneezing, nasal congestion, runny nose, postnasal drip sensation and other symptoms. 2. Allergic rhinitis: cold combined with allergic rhinitis can cause nasal mucosal congestion and increased secretion manifested as frequent sneezing, nasal itching, nasal congestion, runny nose and other symptoms, mostly due to allergic factors such as dust mites, dust, pollen, cold air stimulation, etc., and the symptoms will improve after the antiallergic treatment. 3. Symptoms of acute infectious diseases in the antecedent period: many viral infectious diseases such as measles, encephalitis, hepatitis B, viral myocarditis and other diseases in the antecedent period of infection can be manifested as a class of cold symptoms, such as nasal congestion, sneezing, headache, etc., if the symptoms of cold and flu within 1 week to reduce the symptoms of the emergence of other systemic symptoms can be differentiated. Cold and frequent sneezing self medication is not effective, it is recommended to consult a doctor in a timely manner, under the guidance of specialists to treat the cause.