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Causes of fainting. Fainting (syncope) is caused by a temporary reduction in blood flow to the brain. Blood flow to the brain can be interrupted for a number of reasons. The different causes of fainting are explained below. Fainting is most commonly caused by a temporary malfunction in the autonomic nervous system.
Read about vasovagal syncope, which is a cause of fainting or passing out. If you faint at the sight of blood, needles, or certain sights and sounds, find out why.