A foreign body in the trachea or bronchial tubes of a child may cause a runny nose secondary to infection. However, bronchial foreign bodies are mainly characterized by a history of foreign body aspiration, with spasmodic cough as the main manifestation. Foreign body in trachea and bronchus is one of the common clinical emergencies, which can be categorized into endogenous and exogenous foreign body according to the source of foreign body. Endogenous foreign bodies are pseudomembranes, dry crusts, blood clots, pus, vomitus, etc., which occur as a result of respiratory inflammation, while exogenous foreign bodies are all kinds of objects inhaled through the mouth. According to the degree of airway obstruction, they can be categorized into partial obstruction and complete obstruction. Foreign bodies entering the trachea and bronchial tubes can cause coughing, phlegm and runny nose. Because the foreign body in the bronchial tube leads to poor ventilation, it is easy to secondary respiratory infections. Therefore it is possible to develop the above symptoms. If a tracheobronchial foreign body occurs, must immediately go to the hospital, the road to pay attention to keep quiet, never let the child cry and fight, to avoid foreign body displacement, triggering the child suffocation.