12 doctors weighed in:
What is fainting?
12 doctors weighed in

Dr. Mohammad Homsi
Neurology
6 doctors agree
In brief: Vasovagal
The common cause of fainting is a vasovagal reflex, which the activation of the vagus nerve causing rapid slow down of heart rate causing a sudden shut down of blood supply to the bain and then fainting, as soon as the person falls and be supine the blood supply returs to the barin and the person returns completely awake.

In brief: Vasovagal
The common cause of fainting is a vasovagal reflex, which the activation of the vagus nerve causing rapid slow down of heart rate causing a sudden shut down of blood supply to the bain and then fainting, as soon as the person falls and be supine the blood supply returs to the barin and the person returns completely awake.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Nassir Azimi
Clinical Lipidology
4 doctors agree
In brief: Passing out
Loss of consciousness is fainting.
Typically from transient inadequate flow to the brain. Can be caused by dehydration, vasovagal syn cope, trauma, intracranial bleeding, etc.

In brief: Passing out
Loss of consciousness is fainting.
Typically from transient inadequate flow to the brain. Can be caused by dehydration, vasovagal syn cope, trauma, intracranial bleeding, etc.
Dr. Nassir Azimi
Dr. Nassir Azimi
Thank
Get help from a real doctor now
Dr. Tonga Nfor
Board Certified, Internal Medicine - Cardiology
12 years in practice
507K people helped
Continue
107,000 doctors available
Read more answers from doctors