Which Wind Heat herb is described as treating exterior excess and exterior deficiency?

• A. Gui Zhi
• B. Ma Huang
• C. Jing Jie
• D. Xiang Ru

Answer: (A)

Releasing the exterior while supporting the body’s defensive qi is the key idea here. Gui Zhi is warm and acrid, and it distinctly both disperses the exterior by promoting sweating to expel wind and opens the channels, and at the same time it harmonizes the Ying-Wei (the nutritive and defensive qi). This dual action makes it suitable when the exterior invasion presents with strong surface symptoms (excess) or when the defensive qi is weak (deficiency) and the pattern is more fragile. In other words, Gui Zhi can help with exterior conditions whether the surface shows robust symptoms or where the body’s protective qi is deficient, which is why it’s the best fit for treating exterior patterns that span both excess and deficiency. The other herbs focus more narrowly on exterior release without addressing Wei qi deficiency to the same extent.