secret prescription handed down from one’s ancestors 祖传秘方
the theory of yin-yang and five elements （metal, wood, water, fire and earth ） 阴阳五行学说
heart 心
liver 肝
spleen 脾
stomach 胃
lung 肺
kidney 肾
internal causes (joy, anger, worry, thought, grief, fear and surprise) 内伤七情（喜、怒、忧、思、悲、恐、惊）
external causes (wind, cold, heat, wetness, dryness and fire) 外感六淫（风、寒、暑、湿、燥、火）