打嗝在医学上称之为呃逆,是一种常见的生理现象,为膈肌痉挛收缩引起。正常人在饮水、进食后,或受到冷刺激、激动等情况下就会突然打嗝。大部分打嗝持续时间短,当打嗝发作时间持续超过48小时未能停止或进行性加重,称为顽固性呃逆,是疾病的征象。打嗝是一种反射活动,其反射弧由三部分组成:传入神经、中枢和传出神经,主要牵涉的是膈神经和迷走神经。因此,在反 Hiccups in medicine called hiccups, is a common physiological phenomenon, caused by contraction of the diaphragm spasm. Normal people in the drinking water, eating, or cold stimulation, excitement and other circumstances will suddenly burp. Most hiccups have a short duration, and when the hiccups have lasted for more than 48 hours they fail to stop or worsen, known as refractory hiccups, as signs of illness. Hiccups are a type of reflexive activity whose reflex arc consists of three components: afferent, central and efferent nerves, mainly involving the phrenic and vagus nerves. Therefore, in reverse