Which symptom is described as bluish skin around the mouth?

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Bluish skin around the mouth signals cyanosis, which means the blood isn’t carrying enough oxygen. This is a critical sign of inadequate oxygenation and points to potential respiratory or cardiovascular problems, or severe exposure to cold, and it requires urgent assessment and action. In a field or training scenario, noticing lips or around-mouth coloring helps you recognize a serious condition quickly and pursue appropriate steps—check breathing, call for help, and provide oxygen if you’re trained to do so, while monitoring the person.

The other symptoms described are not indicators of this oxygenation issue. Restlessness or calmness reflects mental state or anxiety, nausea and vomiting point to stomach or systemic issues, and sweaty but cool skin can occur with shock or exertion but doesn’t specifically flag oxygen deficiency in the way cyanosis does.