The knowledge of the cause and the pathogenesis of the apoplexy before Tang dynasty and Song dynasty focused on exopathic wind.

唐宋以前对中风的病因病机的认识，主要以“外风”立论。

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Both endopathic factors and exopathic factors might cause fatigue, but overstrain was the main etiology.

内因、外因均可导致疲劳，但以内伤尤其过劳为主要病因。

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The Classics of internal Medicine points the cause of apoplexy is very complex. Both exopathic factors and internal cause can lead to apoplexy. its pathology is also complex.

指出《内经》认为中风的原因极其复杂，内因、外因均可导致中风。

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