What health problems cause oxygen levels to drop on exertion?
Health problems such as inflamed, swollen or aching of joints, heart conditions and diseases that affect respiratory organs will lead to a drop in oxygen levels. For more information, go to http://www.breathing.com/articles/oxygen.htm.
Well O2 levels will drop on exertion that's normal. It depends on how much it drops.should not drop below 90%. Some reasons for low O2 sat are COPD, CHF.