Children always coughing is common in the following cases: 1, pertussis. Children have not been vaccinated with pertussis vaccine or have been vaccinated normally, the cough is paroxysmal, persistent cough, sputum, heavy at night, the mental state is general, can be accompanied by fever, blood test can be seen leukocytosis, X-ray chest X-ray can be seen in the lungs of the thickening of the texture, you can draw blood tests to clarify the treatment of macrolides, such as erythromycin, azithromycin, etc. 2, cough variability asthma, coughing at night, mainly a persistent dry cough, antibiotic treatment is not effective, after the application of anti-asthma drug treatment is effective, you can go to the hospital for pulmonary function testing to clarify. Cough variant asthma, cough mainly at night, was persistent dry cough, antibiotic treatment effect is not good, after giving the application of anti-asthma drug treatment is effective, you can go to the hospital for lung function test clear.