An abnormal and persistent fear of blood is known as homophobia or haemophobia. The physical reactions sometimes result in vasovagal syncope (fainting). This is because the reaction to a fear of blood can cause an initial increase in blood pressure, followed by a sudden drop, which can result in fainting.
The phobic reaction can be triggered by the sight of the blood of another person, an animal, and sometimes in printed images or video of blood.
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