Wei-Qi-Ying-Xue Differentiation
wèi qì yíng xuè biàn zhèngPatterns
Overview
Wei-Qi-Ying-Xue Differentiation is a diagnostic framework established by Qing dynasty physician Ye Tianshi for assessing exogenous warm-heat diseases (wen bing), delineating four progressive stages of pathogenic depth and severity. It guides treatment principles according to the layer affected, from superficial defense to deep blood level.
Theoretical points
- The system categorizes warm-heat disease progression into four layers: wei (defense), qi (qi), ying (nutritive), and xue (blood), reflecting increasing depth of pathogenic invasion.
- Wei-level syndrome indicates exterior invasion, marked by fever with mild aversion to cold, slight thirst, and a floating rapid pulse; treatment uses acrid-cool formulas to release the exterior.
- Qi-level syndrome signifies pathogenic heat entering the interior, presenting with high fever without chills, profuse sweating, thirst, and a large surging pulse; treatment focuses on clearing heat and generating fluids.
- Ying-level syndrome involves heat entering the nutritive layer, characterized by night-aggravated fever, irritability, insomnia, faint rashes, and a crimson tongue; treatment aims to clear the nutritive layer and vent heat outward.
- Xue-level syndrome denotes heat stirring blood and consuming yin, with manifestations such as bleeding, pronounced rashes, delirium, and convulsions; treatment employs cooling blood and dispersing stasis.
Common patterns
- Progression typically follows a sequence from wei to qi, then ying, and finally xue, indicating escalating severity and deeper pathogenic involvement.
- Failure to resolve the exterior at the wei level allows heat to penetrate inward, transitioning to qi-level syndromes.
- At ying and xue levels, heat damages yin and disturbs the blood, potentially leading to life-threatening complications like hemorrhage or wind-stirring.
- The framework emphasizes that treatment must match the layer, with inappropriate therapy potentially driving the pathogen deeper.
Daily care
- During wei-level illness, rest and avoiding wind exposure are advised to support exterior resolution.
- At qi and deeper stages, maintaining hydration and consuming light, easily digestible foods help counter fluid loss from fever and sweating.
- General lifestyle measures include adequate sleep and stress reduction to support recovery from febrile illnesses.
Connections
Educational content on traditional medicine; not a substitute for a qualified practitioner.