A child who starts coughing well every evening may be caused by Mycoplasma pneumoniae infection or airway allergies. 1. When a child is infected with Mycoplasma pneumoniae, it usually manifests itself as a violent spasmodic cough, which is obvious at night, and some children may have fever and wheezing. 2. If the child is allergic, after contact with allergens, it will cause the child’s airway to become hyperreactive, airway allergy symptoms, manifested in the evening and morning after getting up, coughing symptoms, some children will be accompanied by nasal congestion, runny nose, sneezing symptoms. When the child often appears in the evening to start obvious cough, to take the child to the hospital pediatrics in a timely manner, to clarify the specific causes of the disease, and for the cause of the appropriate intervention treatment.