Bronchial foreign bodies often cause coughing, and the symptoms and degree of coughing are related to the size of the foreign body, the location of the stuck trachea, and the length of time it occurs. When a foreign body enters the voice box, it often irritates the local mucosa and causes a reflex cough, which is more violent and is often accompanied by varying degrees of breath-holding. When the foreign body is small and can enter the trachea or bronchus, the stimulating effect of the foreign body can be reduced and the patient’s cough can be less severe, which can be manifested as a mild cough. Sometimes the foreign body enters the airway and damages the mucous membrane of the trachea, the patient may cough with blood in the sputum and chest pain to varying degrees. When a foreign body is stuck in the distal bronchus, the patient may develop obstructive pneumonia, pulmonary atelectasis, or even lung abscess, in which case the degree of coughing increases and a large amount of purulent sputum is often coughed up.