One effect of this lack of oxygen to the brain is a headache.

VOA: special.2009.07.14

The first is the lack of oxygen in the extremely thin air.

VOA: special.2010.06.30

It results from a lack of oxygen to the brain.

VOA: special.2009.07.14

"This will wedge itself in so tightly and completely block the airway that within minutes, because of lack of oxygen, a child will die."

VOA: standard.2010.02.23