The pathogenesis characteristics of Henoch-Schönlein purpura (HSP) in children align with the theoretical connotation of "kidney responding to winter." In winter

yin qi is excessive

while yang qi is deficient. Humans respond to nature. When yang qi is hidden in the kidney

there is insufficient yang qi of the defensive exterior. Thus

it is easy for the kidney to be attacked by the pathogenic qi of the human body

which leads to the occurrence of HSP. The theory can be expounded from many angles

such as the correspondence between nature and man

a latent pathogen being triggered by the attack of pathogenic qi

the damage of collaterals

and the depression of Xuanfu. An effective way to reduce the incidence of HSP is to comply with the kidney being the dominator of storing essence and avoid other pathogenic qi attacking the kidney. After the onset of the disease

the way to prevent the transmission of pathogens is to eliminate the external pathogens that damage yang qi

remove internal pathogens that damage the kidney

and restore the function of the kidney as the dominator of storing essence. The way to prevent recurrence after remission is to nourish the kidney and consolidate defensive qi by taking into account other viscera. Prevention and treatment can be carried out according to the characteristics of pathogenesis in different periods

such as the disease-free period

deficiency of defensive qi and pathogenic qi attacking period

excessive pathogenic qi in the interior period

and positive deficiency of vital qi and pathogenic qi lingering in the period.