Children often have coughs because of the sensitivity of their respiratory tract, especially during the change of seasons. There are many causes of coughs in children, such as air irritation, respiratory diseases and allergies. Air irritation is a common cause of coughing in children during the fall and winter months when the cold air causes the blood vessels in the respiratory tract to constrict, causing discomfort in the throat and resulting in a cough. In addition, poor air quality, dust, car exhaust and second-hand smoke can irritate the respiratory tract and cause coughing. Respiratory illnesses, such as viral or bacterial infections of the child’s respiratory tract, can cause coughing symptoms. The spring and fall seasons, in particular, are a time of high incidence of respiratory diseases in children because their immune systems are not yet well developed and have poor resistance, making them vulnerable to invasion by bacteria and viruses. It is very common for children to develop a cough due to allergies, such as animal hair allergies and pollen allergies, as soon as they come into contact with certain allergens. The symptoms of allergies are usually accompanied by coughing and redness and itching of the skin. Many parents use cough medicine as soon as they find their child coughing. Relying on cough medicine alone will not cure the symptoms, but will also make the child resistant to the medicine.