How does the child cough repeatedly for half a year to do

Children appear repeated cough for more than half a year, first suspected to be related to allergic cough caused by allergies, secondly, this chronic cough may also be caused by lung infection. Therefore, after the cough symptoms must be timely medical treatment, identify the causes of cough in children after treatment, in the treatment of primary disease at the same time, can use antitussives to alleviate cough symptoms in children.