Dysphagia, or difficulty swallowing, is the inability or difficulty of a patient to swallow food for various reasons. The degree of swallowing disorder varies depending on the nature and severity of the lesion. In mild cases, swallowing may be difficult and often requires the use of soup or water; in severe cases, it may be difficult to enter with a drop of water. There are various causes of swallowing disorders, which can be divided into three main categories. There are functional swallowing disorders, diseases caused by certain congenital anomalies, such as posterior nostril atresia and cleft palate, which usually appear right after birth. There are obstructive swallowing disorders, such as those caused by narrowing of the pharynx or esophagus, tumors or foreign bodies; early stages of esophageal cancer, which can cause a “choking” sensation when eating hard food. There are also paralytic swallowing disorders, such as paralysis of pharyngeal muscles caused by central diseases or peripheral neuritis, which causes swallowing difficulties, and swallowing difficulties are more obvious when eating liquids. In addition, there are temporary swallowing disorders caused by inflammation of the pharynx, such as acute suppurative tonsillitis, which increases pain when swallowing and makes it difficult to swallow food. For patients with dysphagia, it is necessary to go to the Department of Otolaryngology as soon as possible to have a checkup, and after a clear diagnosis, treatment should be carried out under the guidance of a doctor.