“四逆散”一方原出《伤寒论》治少阴病热化的四逆症。“四逆散”主治传经热邪,阳气内郁,不能外达,四肢厥逆,属于“热厥”范畴。其病理变化与“四逆汤”证阴盛阳虚,四肢逆冷,甚者过于肘膝,脉微细,阳气不足的“寒厥”完全不同。“四逆散”的作用为透解郁热,疏肝和胃,转运机枢, “Sini San” side of the original “Treatise on Febrile Diseases” treatment of Shao Yin disease heating. The “Sini San” instigator passes heat and evil, and the yin and qi can not be taken outside and the four limbs are disobedient. It belongs to the category of “heat 厥”. The pathological changes and the “Sini decoction” evidence of yin and yang deficiency, cold extremities, even worse than elbows and knees, fine veins, yang deficiency “chilling” is completely different. The role of “Sini San” is to permeate Yu Yu, soothe the liver and stomach, and transfer pivots.