3. Mental Shock
Sometimes, a particularly bad mental shock can give rise to a fainting spell; this is usually used in movies purely for comedic effect. When last did you see a movie where someone fainted after they saw something that horrified or surprised them? This doesn’t happen nearly as much in real life as it does in movies, but a mental shock of some sort can still be behind a bad fainting spell.
To understand why this happens in the first place, we’ll have to explore just what happens to you during shock: The blood pressure will either go straight up or straight down, and this alone can send you into a panic attack – and subsequent hyperventilation. These are all things that will take oxygen-rich blood away from the parts that your body needs, and the shock that your body experiences as a result can cause you to pass out – or lose consciousness.