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Vasovagal Syncope. Vasovagal syncope (also called cardioneurogenic syncope) is a temporary loss of consciousness caused by a neurological reflex that produces either sudden dilation of the blood vessels in the legs, or a very slow heart rate (bradycardia), or both.
Heat Syncope. Heat syncope or fainting is a mild form of heat illness that often results from physical exertion when it is hot. It occurs when your body, in an effort to cool itself, causes the blood vessels to dilate to such an extent that blood flow to the brain is reduced. Inadequate fluid replacement, which leads to dehydration, usually contributes greatly to this illness. Symptoms.