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What causes a person to faint?
Fainting, or passing out, is usually caused by a drop in blood pressure, which reduces blood flow and oxygen to the brain. Most fainting spells are nothing to worry about.
What happens when someone faints?
Fainting occurs when your brain temporarily doesn’t receive enough blood supply, causing you to lose consciousness. This loss of consciousness is usually brief. Fainting might have no medical significance. Or the cause can be a serious disorder, often involving the heart.
Does blood pressure drop fainting?
Fainting usually is caused by a temporary drop in blood pressure. During that brief drop, the brain does not get the blood flow that it needs—and you lose consciousness.
What is the first thing to happen when you faint?
It begins with an increase in heart rate and blood pressure, followed by a fall in blood pressure and heart rate at the time of the faint. People often feel nauseated before they faint (thought to be due to the back of the brain not getting enough blood supply) and may vomit,” Corcoran said.
What causes a person to faint from high blood pressure?
“The blood vessels dilate and the heart rate slows, and as a result the combo of drop in blood pressure and slowing of the heart rate causes one to faint,” Jaradeh said. This type of fainting is referred to as vasovagal syncope — the most common cause of fainting.
What does it feel like when you faint from pain?
People often feel nauseated before they faint (thought to be due to the back of the brain not getting enough blood supply) and may vomit,” Corcoran said. Fainting can occur quickly for some people, particularly with pain triggers, she added.
What does it mean when you faint from lack of oxygen?
Fainting is a temporary loss of consciousness that happens when the brain does not receive enough oxygen. It comes on suddenly, only lasts for a short time and you recover fully within a short time. It is also often called a blackout.