The child cough for a month or a little dry cough, may be related to inflammatory diseases, cough variant asthma, allergies and other reasons. 1. Inflammatory diseases: bacterial, viral, mycoplasma and other infections caused by the child’s cough for a month of symptoms, the condition is not controlled in time, will be further development of bronchitis, pneumonia and other diseases, the patient will be intermittent symptoms of dry cough. 2. Cough variant asthma: a child coughing for a month or a little dry cough, may also be cough variant asthma, inhalation of cold air, strenuous activities will be prone to dry cough symptoms. 3. Allergies: A child with a cough that is still a little dry after a month may be caused by allergies, the child encounters allergens, the cough symptoms will reappear. The child cough for a month or a little dry cough, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.