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Any instance of passing out should be evaluated by your doctor.
While your doctor may not be able to always suggest a cause, the American Academy of Family Physicians mentions these common triggers for fainting:
- Standing up too quickly.
- Playing or working vigorously, particularly in a hot environment.
- Breathing too quickly, also known as hyperventilating.
- Feeling extremely upset, which can affect blood pressure.
- Taking medication for high blood pressure.
-- Diana Kohnle
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