The elderly always choke on their meals for reasons including physiological choking and ball palsy, as follows: 1, physiological choking: as the elderly age, they may have a weakened pharyngeal reflex, and when food passes through the vocal cords, if the vocal cords do not close reflexively in time, it may lead to food residues falling into the airway causing choking; 2, ball palsy: the elderly often have cerebral infarction or cerebral hemorrhage and other cerebrovascular diseases, if there is bilateral cerebral Hemispheres, brainstem involvement, can cause pseudo or true ball palsy, resulting in muscle dysfunction in the throat, which can easily cause choking and coughing. In this case sometimes there is a loss or weakening of the pharyngeal reflex, sometimes due to motor disorders of the muscles of the pharynx, and patients tend to choke more easily when eating liquids such as clear water, while eating dry food, often accompanied by swallowing difficulties, and eating semi-liquid food without choking easily can also be swallowed.