What is the cause of the child's morning cough?

Children cough in the morning is likely to be caused by inhalation of animal hair, dust mites and other foreign matter, but also may be caused by excessive indoor dryness. In addition, if accompanied by sneezing, nasal congestion, runny nose and other phenomena, it needs to be considered as the cause of cold or influenza, can be identified by blood routine, bacterial culture, virus isolation and other tests.