What are possible reasons for fainting with no heart or blood sugar abnormalities?

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.
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.
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.
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.
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.
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.
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.
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.
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.