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What happens if your oxygen levels get too high?

I was told that getting too much oxygen can be just as dangerous as not getting enough. Is this true? What happens if a person gets too much oxygen?  

My aunt's private dr placed her on 7 lpm of O2 through the nasal cannula but when we took her to the hospital the doctors there said she was getting way too much O2 and lowered it to 2 lpm. 

What are things we need to be looking for to see if she is getting too much oxygen once she leaves the hospital and her dr. increases it back to 7 lpm ?
Related Topics: Oxygen, Vision