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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.
Answer Wiki. Feeling light-headed or passing out is caused by a drop in blood pressure. Blood pressure is maintained primarily by the the blood vessels of the body, which contain muscle fibers allowing them to constrict. The body's ability to control which blood vessels constrict allows the body to direct blood flow.