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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.
People faint at the sight of blood. Parents faint when their kids get immunized. Older people faint in church. Many types of emotional and physical stressors can stimulate the vagus nerve to do damage. But on occasion, the cause of the faint is not vasovagal syncope but something more serious. Encouraging the person to seek medical care or calling 911 may save a life. While it may be an inconvenience or sometimes an embarrassment to a patient, being unconscious is not normal.