《伤寒论·辨厥阴病脉证并治》
如果吃后突然发热而又猝然退去的，是除中证；如果吃后不出现这种发热的，可以断定胃气仍然存在，其能食是阳复的表现，就一定会痊愈。
后三日脉之，其热续在者，期之旦日夜半愈。
If, after eating, fever suddenly arises and then just as suddenly recedes, this is evidence of 中气 exhaustion; if, after eating, such fever does not arise, it may be determined that stomach-qi is still present, and that the patient’s ability to eat is a sign of yang-qi recovering, and he shall assuredly be healed.