8 doctors weighed in:
What are possible reasons for fainting with no heart or blood sugar abnormalities?
8 doctors weighed in

Dr. Mohammad Homsi
Neurology
6 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exhausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Mohammad Homsi
Neurology
4 doctors agree
In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.

In brief: SYNCOPE
Fainting can be caused by vasovegal reflex which is an activation of the vagus nerve that innervates the heart, when it is activated it decreases the heart rate and decreases blood supply to the brain and leads to the fainting.
Vasovegal reflex can occur in any scary or frightening accident, a warm weather and being dehydrated or exausted may contribute to fainting.
Dr. Mohammad Homsi
Dr. Mohammad Homsi
Thank
Dr. Kevin Lingle
Internal Medicine - Cardiology
2 doctors agree
In brief: Vasovagal
If you have been worked up by a physician and there has been no idenifiable cause, then it is likely a vasovagal episode; however, if you have not been evaluated by a physician, i suggest you tell your primary doctor.

In brief: Vasovagal
If you have been worked up by a physician and there has been no idenifiable cause, then it is likely a vasovagal episode; however, if you have not been evaluated by a physician, i suggest you tell your primary doctor.
Dr. Kevin Lingle
Dr. Kevin Lingle
Thank
Get help from a real doctor now
Dr. Bennett Machanic
Board Certified, Neurology
48 years in practice
55M people helped
Continue
108,000 doctors available
Read more answers from doctors