The generation of clinical symptoms after a foreign body enters the airway is related to the size of the foreign body, the site of embeddedness, the length of time and other factors. When the foreign body is large, it can cause respiratory distress and asphyxia, which can lead to death if not rescued in time; when the foreign body is small, it will first appear violent choking and coughing with respiratory distress. If the patient coughs to expel the foreign body, the symptoms can be relatively relieved and improved. Part of the population foreign body can not be discharged in time, but by the position change, airflow impact and other factors. If the location of the foreign body changes, the patient may show repeated irritating choking cough or choking symptoms suddenly disappear, followed by lung infections in a few days or weeks, and very few patients may have recurrent lung infections and hemoptysis. Failure to expel the foreign body from the trachea may be assisted by the Heimlich maneuver, and if necessary, the patient may need to have the foreign body removed bronchoscopically.