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External causes
外因 〔外因〕 wài yīn
One of the three causes of disease; any evil that assails the body from outside, as described in Sān Yīn Jí Yī Bìng Zhèng Fāng Lùn (三因极一病症方论 Unified Treatise on Diseases, Patterns, and Remedies According to the Three Causes
). External causes are the six excesses, epidemic qì and warm evil. See