Shao Yu: the Yellow Emperor's minister. He had conversations with the Yellow Emperor about the Five Circuit Phases and the Six Atmospheric Influences in the Yellow Emperor's Cannon of Medicine.

1. The Yellow Emperor asks, "What kind of people most easily get ill when they feel the wind of the four seasons?"
2. Shao Yu answers, "People of yellow color, with thin skin and weak muscles can't bear the wind in spring. People of white color, with thin skin and weak muscles can't bear the wind in summer. People of green color, with thin skin and weak muscles can't bear the wind in autumn. People of red color, with thin skin and weak muscles can't bear the wind in winter. Wind-cold illness: A syndrome caused by an attack of wind and cold in combination. Marked by light fever, headache, clogged nase, sneezing, a thin and white coated tongue, and a floating and tense pulse."
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