Homologous essence and blood, deficiency and failure of essence and qi, leading to endogenous deficiency and heat due to blood dryness or pathogenic wind due to blood dryness. Easily upset, dry nasopharynx, muscular atrophy, dry skin or incorrect nails, itchy skin, or excessive dandruff.

Dry body fluid and blood: pathogenesis. Because body fluid and blood are homologous, body fluid is deficient, while blood dryness is endogenous due to deficiency heat, and blood dryness generates wind. Most of them are caused by excessive heat damaging body fluids, or burns, or excessive heat due to yin deficiency consuming body fluids. Clinically, symptoms such as dry nasopharynx, dry mouth and thirst, dry and itchy skin, emaciation of muscles, short and red urine, red tongue and little body fluid, and rapid pulse can be seen.