Why do people faint at sight of blood?




Why do people faint at the sight of blood?


Why do some people feel dizzy or faint when they see blood , is, for most of one of the mysteries of the universe. Because of this fear, many people are afraid to go hunting or fishing, and a simple blood donation for them becomes a real torture. Although this is a fairly common phobia (from her suffer on average 3.4 percent of people), symptomatic, it is different from other phobias. For example, blood pressure begins to rise, and the pulse of the heart is slowed down, whereas in the case of other fears he quickens the contrary. So what is the essence of this phobia?

John Sanford of Stanford medical school he feels fear at the sight of blood, and therefore set the goal to understand this phenomenon. And that’s what he was able to install:

“This is a vasovagal reaction. Cranial nerve, which is a component of the parasympathetic nervous system that extends from the brain stem through the neck, chest and stomach. It allows you to control the derivative functions, such as a slow heart rate and the flow of gastric juices. But when his response is excessive (for example, in response to starvation, dehydration, rapid build-up, long standing, intense laughter, sudden fear, harsh cough, pain, nausea, and perception of the blood), cranial nerve causes a vasovagal reaction, which is usually not observed with other phobias ”

There are several theories designed to explain this phenomenon. One of them is that it is a defense response in dangerous situations, like when he “pretends to be dead,” and lowers blood pressure in order not to lose a lot of blood when cut. This phobia in people with the process of evolution, so it makes sense to consider this theory as quite probable.

Sanford has learned, there are professionals who are able to save people from such fear. Squeezing the muscles in the systematic effects, patients can learn to control the symptoms. After a preparatory period of the doctors are starting to show patients more realistic images of blood. First, it is just a point, and then the red dot, then picture the blood and so on. To do so as long as the patient is not able to look at the blood, without collapsing. Incidentally, a similar technique has been used to treat other fears – for example, arachnophobia or illness spiders. In the end, unable to control blood pressure, which is the shortest way to complete recovery.

Therefore, if you gnawing conscience about what you want to be a donor, but for the above reason, just can not do this, we suggest you contact a specialist. After all the blood – it is something quite natural, and fear it is just silly.

Tags: Health , Medicine .


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