Turning Blue
If a person's skin or face is turning blue, it means they have critically low oxygen levels in the blood. Seek immediate emergency care if someone is turning blue, as they are at risk of internal suffocation.
Turning blue, or cyanosis, is caused by a lack of oxygen in the blood. It can be a sign of a serious medical condition, such as respiratory or heart failure, or it may be caused by exposure to cold temperatures or high altitude.
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