《伤寒论·辨太阳病脉证并治中》
太阳中风证，经过六七天而不解除，既有发热、畏寒、头痛等表证，又有心烦、小便不利等里证，如果出现口渴想喝水，一喝水即呕吐，这就叫水逆，用五苓散主治。
中风发热，六七日不解而烦，有表里证，渴欲饮水，水入则吐者，名曰水逆。五苓散主之。
For solar stroke, if after six or seven days the symptoms have not subsided, and there are both external symptoms such as fever, chills, and headache, and internal symptoms such as irritability and difficulty urinating, if the patient is thirsty and wants to drink water, but vomits after drinking water, this is called water retention, and is treated with Wuling San.