The throat is one of the most important organs in the body and its main function is to swallow, breathe and make sounds. If there is an abnormality in the throat, it can cause pain in the throat with foreign body sensation in mild cases, and in severe cases, it can lead to inability to eat, difficulty in breathing or inability to speak. Therefore, it is important to protect the throat, eat a light diet, reduce excessive use of the voice, and seek medical attention for early treatment if there is discomfort. 1. swallowing function: swallowing is done by the muscles of the throat under the innervation of the nerves, and the throat is the way for food to enter the stomach from the mouth. 2. respiratory function: the throat is an important part of the respiratory channel, and the throat has an auxiliary role in alveolar gas exchange and maintaining the acid-base balance of body fluids. If the patient cannot breathe through the nose, he can breathe through the throat with open mouth; 3, vocal function: the pharynx is an articulatory organ, and the main part of articulation is the vocal cords, which is controlled by the central nervous system through the recurrent laryngeal nerve; 4, other: the pharynx has tonsils, adenoids and many lymphatic tissues, which can play a defensive role against pathogenic bacteria that invade the body when the body’s resistance decreases. In addition, the larynx can raise the abdominal and thoracic pressure by closing the vocal cavity as a way to complete the coughing and vomiting actions.