Children do not have a cold dry cough during the day, not cough at night, take a month or two cough medicine has no effect, most of the considerations are due to allergic factors, and personal constitution, need to find allergens, as soon as possible to clarify the diagnosis, as soon as possible to implement symptomatic treatment. As a result of the child belongs to the allergic body or the recent low immunity, resulting in a certain allergic substances or allergic environment has produced an immune response, induced allergic symptoms, manifested in the persistence of the daytime dry cough without a cold, the night does not cough, take cough medicine has no effect symptoms. The specific allergens or allergic environments that children are allergic to need to be observed by parents on a daily basis, such as pollen and dust. If you can’t identify the cause of the allergic reaction, you can use an allergen test to determine the cause of the allergic reaction, and then implement anti-allergy treatments as soon as possible under the guidance of a doctor to alleviate the symptoms as soon as possible. Children do not have a cold daytime dry cough, no cough at night to take cough medicine did not have the effect of a couple of months, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, to give targeted treatment or treatment.