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A member asked:
How low does yur oxygen level have to be to have a headache?
A doctor has provided 1 answer
See below: Low oxygen does not usually cause headaches. On the flip side, oxygen supplementation often relieves headaches because increasing oxygen causes the blood vessels in the brain to constrict, often improving symptoms. Low oxygen mainly causes shortness of breath and dizziness.
Answered 4/4/2013
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