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Too much carbon dioxide in the bloodstream can cause hypercapnia, a fatal condition if left untreated.

Too much of the gas in a person's bloodstream, known as hypercapnia, can kill them if not treated.

The AP has previously debunked posts that claim without evidence that wearing a face mask causes hypercapnia, a condition where too much carbon dioxide enters the bloodstream.

Claims that mask-wearing leads to harmful conditions, including bacterial and fungal infections, pneumonia, hypercapnia and other ailments are also false, according to AP reporting.

We've seen lots of posts alerting people to this potentially harmful side-effect - called hypercapnia - where there's too much carbon dioxide in the blood.