The causes of occasional dry cough in children mainly include chronic pharyngitis, allergic cough, cough variant asthma, as follows: 1, chronic pharyngitis: after suffering from acute pharyngitis, if the treatment is not complete, it will migrate into chronic pharyngitis, causing occasional dry cough in children; 2, allergic cough: if you belong to the allergic body, to the cold air or other odors and other sensitivities, it will also cause occasional dry cough; 3, cough variant asthma: occasional dry cough will occur, and will also be accompanied by coughing exacerbation after the exercise.