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。
2
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。
3
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.