Tongue Sign
Exterior	Wind Cold: Thin, white Coating
	Wind Heat: Thin White coating turning yellow
Interior	Changes in body color and shape
Half-Exterior Half-Interior	White coating on one side only, or White anteriorly, yellow or black posteriorly

Tongue Diagnosis and the Eight Principles

Cold	Pale/Blue Body White Coating; Deficiency: no coating
Hot	Red body, yellow coating; Deficiency; no coating
Exterior	Thick coating
Interior	Cold: Pale body, thick coating, slippery and white
	Hot: Red body, thick and yellow coating
	Stasis of Blood: Purple body
	Phlegm: Thick, slippery and greasy coating
Qi	Lung: flaccid body, slighly swollen anteriorly
	Spleen: toothmarked on edges (Scalloped)
	Stomach: lack of coating in center
	Heart: pale body
Yang	Pale body
	Spleen: pale body, white coating, wet
	Kidney: pale body, swollen, white coat
	Heart: pale body, bluish if severe
Blood	Spleen: pale body, dry
	Heart: pale body, tip even more so
	Liver: pale body, sides paler
Yin	Stomach: no coating in center, dry, wide crack in center
	Kidney: Red body, no coating dry, cracks
	Heart: Red body, no coating anteriorly, tip redder
	Lungs: Red body, no coating, cracks anteriorly