Why some people faint at the sight of blood: Causes, body response, warning signs, and prevention tips |
Fainting at the sight of blood is common to many people and usually occurs without warning. Again, it is unrelated to fear or squeamishness; rather, it involves elaborate physiological mechanisms. During overstimulation of the nervous system with certain stimuli, such as blood loss or emotional stress, blood flow to the brain may be temporarily reduced,…