How Fainting Happens?

Fainting, or syncope, usually results from hypoxia, or a lack of oxygen to the brain.

Causes include problems with the lungs or blood circulation and carbon monoxide poisoning.

Fainting is a mechanism to help a person survive.

If brain blood and oxygen levels drop considerably, the brain immediately shuts down all other non-vital parts of the body so that resources can focus primarily on vital organs.

When the brain detects lower levels of oxygen, the body will start breathing faster, or hyperventilating, to bring levels back up again.

The heart rate will also rise in order to get more oxygen into the brain. This rise in the heart rate results in hypotension, or a drop in blood pressure, in other parts of the body. The brain receives extra blood, at the expense of other parts of the body.

Hyperventilation combined with hypotension may result in short-term loss of consciousness, muscle weakening, and fainting.

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.