A bluish coloration of the skin or mucous membranes due to too much deoxygenated haemoglobin in the blood. Cyanosis confined to the hands and feet is not serious and is usually due to slow blood flow, often as a result of exposure to cold. A blue tinge to the lips and tongue, however, could be due to a heart or lung disorder such as chronic obstructive pulmonary disease or heart failure.


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