Vigorous Mental Status is a sign of exhaustion of essence and deficiency of Qi.
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Clinically Lethargic mental status is a sign that the illness is grave and the prognosis unfavorable.
The five favorable ones are: “blue as a kingfisher’s feathers; red as a cockscomb; yellow as a crab’s abdomen; white as lard; and black as a crow’s feathers.” This indicates that Qi and blood have not been depleted, so that though ill the patient can be cured.
A blue complexion suggests Heat and Fire.
A yellow color suggests deficiency of Qi and blood or Dampness in the body.