After the foreign body enters the airway, the specific hazards are as follows: 1. When the foreign body is large, it can immediately cause respiratory distress, cyanosis of the lips, asphyxia and other symptoms, which may lead to death if the foreign body is not rescued in time. 2. When the foreign body is small, there is often a severe cough, accompanied by a certain degree of respiratory distress; if the foreign body is expelled from the body through the cough reflex, the symptoms of cough, chest pain and respiratory distress will slowly reduce or improve. If the foreign body cannot be expelled from the body, it will cause chronic inflammation in the lungs and long-term symptoms such as cough, dyspnea and chest pain. Therefore, once this happens, you should immediately seek medical attention and take measures to remove the foreign body as soon as possible in order to avoid or reduce the occurrence of asphyxia and other complications.