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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.
The sight of blood is associated subconsciously with injury since for a normal person, this is only source for the sight of blood. This perception of injury causes stress to the person. Too much stress will lead to over-activation of the parasympathetic response and this will cause fainting. Note: This parasympathetic response can also why the some people experience nausea at the sight of blood or some other distressing event.