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A purple coloration of the tongue indicates an impaired flow of blood and qì leading to congealing blood stasis. A purple tongue is observed in either heat or cold patterns. A generalized green-blue or purple coloration indicates severe blood stasis. Purple macules indicate less severe or localized blood stasis. A glossy green-blue or purple tongue characterizes cold patterns caused by failure of yáng qì to warm and move the blood. A dry reddish purple tongue indicates binding blood stasis due to penetration of heat to the blood aspect.

See tongue examination.

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