Level 1: What is allergic cough in children? Allergic cough refers to a disease caused by repeated and frequent dry cough or a small amount of white foamy sputum after exposure to certain allergens in the respiratory tract. Among all patients with chronic dry cough, about 10% to 30% are caused by allergic cough, and it is more common in teenagers and adults. Level 2: What are the symptoms of allergic cough in children? (1) Dry cough: intermittent, paroxysmal, no sputum or only a small amount of white foamy sputum; (2) accompanied by wheezing