Children’s cough has been bad may be cough variant asthma, improper medication and allergic cough and so on. 1. Cough variant asthma: most children do not have symptoms of wheezing, only for repeated chronic cough, cough paroxysmal episodes, cough in the morning or night cough. 2. Improper use of medication: a child’s cough has been bad may be the type of drugs and dosage is not symptomatic, can also lead to a child has been coughing bad, not easy to heal the phenomenon. 3. Allergic cough: Some children are allergic. Mainly allergic substances stimulate the child’s body to release some histamine, these substances act on the respiratory tract, resulting in airway spasm, resulting in repeated cough. When a child’s cough has been bad, parents are advised to take the child to the hospital in a timely manner, under the guidance of the doctor to clarify the cause of the disease, to take effective treatment.