The trachea is the passage between the larynx and the bronchi. Under normal circumstances, food will not enter the trachea. If food accidentally enters the trachea, it may stay in the trachea or enter the bronchi because of the different size and nature of the food, i.e. tracheal foreign body or bronchial foreign body.1. Tracheal foreign body: If it is a larger food, it may directly block or incompletely block the trachea after entering the trachea, which can lead to difficulty in breathing, wheezing, inability to speak, or even suffocation; if it is a smaller food, it will cause the patient to wheeze violently, cough and hear the sound of food slapping the vocal chambers, and put your hand to your throat to feel the food vibrating in the trachea. If food is stuck in the trachea for a long time, inflammation may form locally in the trachea due to food irritation and corrosion, causing fever and other uncomfortable symptoms; if it is sharp food, such as fish spikes, there may be persistent pain and even cause tracheal perforation; 2. Bronchial foreign body: Because the right main bronchus is short, thick and travels steeper and straighter, the possibility of food entering is higher than that of the left main bronchus, and after food enters the bronchus, it also It will cause patients to have violent wheezing and coughing because of the self-protection mechanism of human body. If the food is more stimulating to the mucous membrane, such as peanut rice and pepper, it may lead to bronchial inflammation and symptoms such as coughing up pus sputum and fever; if it is less stimulating to the mucous membrane and there is no blockage, it may not show obvious symptoms. If the food blocks the bronchus or stays for a long time, it may lead to bronchial dilatation, lung abscess, etc. Sharp food may also cause damage to the esophageal wall and complications such as pneumothorax. In addition to this, food with loose texture such as egg custard and pudding may even enter the lungs and form foreign bodies in the lungs, which can be life-threatening in serious cases. Therefore, in order to prevent food from accidentally entering the trachea, you should concentrate on eating and avoid emotional excitement, especially for children and the elderly.