《伤寒论·伤寒例》
因为少阴经脉穿过肾、络于胸膈，连系舌根，所以少阴病见舌燥、口渴。
以其脉贯肾，络于肺，系舌本，故口燥舌干而渴。
Because the Shaoyin channel passes through the kidneys, is connected to the chest and diaphragm, and is connected to the base of the tongue, Shaoyin disease is characterized by a dry tongue and thirst.