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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 older than 45 years of age rarely experience a first common faint.. Causes of vasovagal syncope include the following: 1  Environmental factors: Most commonly in a hot, crowded setting. 2  Emotional factors: Stress or the sight or threat of injury.