DUBLIN, Ireland -- A doctor based in Dublin, Ireland, has debunked the idea that a face mask lowers oxygen levels. In fact, he's shown that even wearing several has no effect. This video shows Maitiu ...

Dear Doctors: I get crushing headaches every fall, which I’ve always assumed are part of having allergies. But a specialist at our local medical center diagnosed me with cluster headaches. She says ...

You should know the safety spiel well by now – “In the event of emergency, put your oxygen mask on first.” But have you ever wondered why the cabin crew is so careful to hammer this information into ...

Dear Doctors: I get crushing headaches every fall, which I’ve always assumed are part of having allergies. But a specialist at our local medical center diagnosed me with cluster headaches. She says ...