Warming method in Shang Han Lun

Warming method is one of the eight therapeutic methods introduced in Shang Han Lun (Treatise on Cold Damage伤寒论) written by Zhang Ji (Zhang Zhong-jing) in the Eastern Han Dynasty (3th century). This method has the efficacies to eliminate pathogenic cold and recover yang-qi by means of warming interior and expelling cold，restoring yang and rescuing the patient from collapse. In Shang Han Lun, warming method was mostly used for treating interior cold syndromes of Taiyin Disease and Shaoyin Disease. In this paper, we have chosen 4 representative formulae of this category to be introduced to the readers: Li Zhong Wan (Middle–Regulating Pill理中丸), Si Ni Tang （Cold-Extremities Decoction四逆汤）, Wuzhuyu Tang (Evodia Decoction 吴茱萸汤) and Danggui Si Ni Tang (Angelica Cold–Extremities Decoction当归四逆汤).