What happens when someone faints? Why do they? and How?

Answer 1

usually its becase of slowed or lack of blood flow to the brian, can be caused by shock,dehydration and many other things . going from lying down sitting up or standing too quikly is similar the body was not prepared for the rapid change in the position and it takes a second or two to get the heart pumping faster to make up the new Oxygen demands of the brain.

in med-speak wecall fainting Syncope

Answer 2

What Happens When Someone Faints

Answer 3

From the fainter's point of view, these things happen (with some variation, I'm sure):
Dizziness
A whining roar in the ears
Narrowing of the vision (I experienced this as a yellow-gray curtain effect)
Waking up on the floor

Between the white-out or brown-out, there's nothing. No detection of the passage of time, no blackness, like you don't even exist. I even spoke while unconscious
Fainting is caused by a sudden drop in blood pressure. When this happened to me this past winter, I had ripped open my finger and was very angry at my dog. Being hungry and in a just-woke-up state didn't help.
When you faint, you're actually more likely to go straight down than pitch forward. Think of your body standing up. Now remove all muscular support. The body will bend at every supporting joint, and gravity takes it from there. You'll probably wake up contorted, since gravity doesn't give a care about your comfort.
The most frightening thing about fainting spells is that they could be caused by something as simple as hunger or as fatal as heart failure.

Answer 4

Fainting or syncope (SAMPA: /"sIn.k@.pi/ or /"sIN.k@.pi/) is a sudden (and generally momentary) loss of consciousness due to a lack of sufficient blood and oxygen reaching the brain. The first symptoms a person feels before fainting are dizziness, a dimming of vision, or brown-out and feeling hot. Moments later, the person's vision turns black and he or she drops to the floor (or slumps if seated in a chair).

Factors that influence fainting are taking in too little food and fluids, low blood pressure, hypoglycemia, physical exercise in excess of the energy reserve of the body, and lack of sleep. Even standing up too quickly or being in too hot of a room can cause fainting.

Recommended treatment is to allow the person to lie on the ground with his or her legs a little elevated. As the dizziness and the momentary blindness passes, the person may experience visual disturbances in the form of small bright dots (phosphene). These will also pass within a few minutes. If fainting happens frequently, or if there is no obvious explanation, it is important to see a doctor about it.

More serious causes of fainting include cardiac (heart-related) causes such as an abnormal heart rhythm (an arrhythmia), where the heart beats too slowly, too rapidly or too irregularly to pump enough blood to the brain. Some arrythmias can be life-threatening. Other important cardiac conditions that can manifest with syncope include subclavian steal syndrome and aortic stenosis.

Fainting can also be due to neurological disorders, stress, etc.

Answer 5

There are a number of reasons why someone can faint. It also depends on if they have ever fainted before? You can faint because of an anxiety attack, lack of oxygen. If the fainting persists it should be checked out by a doctor to find out the underlining problem.

Answer 6

Last time I fainted I was 3 mos pregnant

Answer 7

Basically your brain tells your body to shutdown so that your body is forced in a horizontal position, which is the best position to get blood to your brain without any intervention from someone else.

Answer 8

Lack of oxygen to the brain causing the "computer to shut down." Usually it's accompanied by severe nausea!

Answer 9

Blood flow to the brain is interrupted for whatever reason. the person will collapse to the floor, usually pitching forward

Answer 10

My brother fainted before becuase he had too much on his mind and he was stressed out. :(