《伤寒论·辨不可下病脉证并治》
如果误用攻下，就会导致口渴很甚。如果渴而想喝水的，为阳气未竭，其预后较好，容易治愈；如果渴又不愿喝水的，为阳气已竭，其病情严重。关部脉濡而弱，寸部脉反弦，尺部脉反微。弦是阳气扰动在上，微是阴寒盛于下，上虽实而下焦虚寒，所以病人喜欢温暖。
下之则大渴，求水者易愈，恶水者剧。脉濡而弱，弱反在关，濡反在巅，弦反在上，微反在下。弦为阳运，微为阴寒。上实下虚，意欲得温。
An incorrect use of breakdown may lead to severe thirst. If the patient is thirsty and wants to drink, it means that the yang qi is not exhausted, and that the prognosis is good, and that the disease can be easily cured. If the patient is thirsty but does not want to drink, it means that the yang qi is exhausted, and that the disease is serious. The pulse in the lower part of the wrist is soft and weak, in the median part of the wrist the pulse is tense, in the upper part of the wrist the pulse is hardly noticeable. Tension means that the yang qi is disturbed at the top, and hardly noticeable means that the coldness is severe at the bottom. Although the top is full, the lower part is empty and cold, and this is why the patient likes to stay in warm places.