Dryness

as an important concept of etiology and pathogenesis in traditional Chinese medicine

is generally believed to be caused by hot injury and body fluid drying up. The understanding of "dryness due to yang decline" is still insufficient

and the clinical treatments are also limited. The description of dryness in the seven chapters on Yunqi accounts for nearly 90% of the whole

Huangdi Neijing;

whether dryness is matched with cold-jin or the climate

phenology and diseases affected by dryness are characterized by Yang decline

and whether dryness syndrome is treated with drugs with warm or hot properties

all treatment strategies are based on the gradual decline of Yang qi as the fundamental attribute of dryness. By systematically elucidating the close relationship between dryness and coolness and exploring the treatment of dryness due to yang decline by other researchers

we hope to provide a theoretical basis for subsequent research on dryness.