Editor's note: Find the latest COVID-19 news and guidance in Medscape's Coronavirus Resource Center. Wearing a mask to protect against transmission of COVID-19 does not decrease oxygen saturation, ...

A non-rebreather mask is a special medical device that helps provide you with oxygen in emergencies. These masks help people who can still breathe on their own but need a lot of extra oxygen.

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Social media users have been sharing content online that claims wearing a face mask causes cancer due to oxygen deficiency. This claim is false. Examples can be seen here; and here. One post reads: ...