The reasons for children not coughing during the day but coughing at night include the following: first, due to children suffering from Mycoplasma pneumoniae infection. If a child is suffering from Mycoplasma pneumoniae infection, especially school-age children, at this time there will be a nighttime cough obvious, and the cough is mainly irritating dry cough, you can give the child timely detection of Mycoplasma pneumoniae IgM antibody in the blood. If it is positive, you can give the child timely application of erythromycin, erythromycin and other drugs treatment. Secondly, the symptoms are caused by children suffering from allergic cough. The reason why some children cough at night is due to allergic cough, children’s cough rarely have sputum, you can timely application of anti-allergy drugs, such as the application of loratadine or cetirizine and so on.