>>82090204The vagal response (vasovagal reflex) is when stimulation of the vagus nerve causes symptoms such as lightheadedness, sweating, and blurred vision. This can happen because of stress, pain, heat, having a bowel movement, or even standing too long.
>>82090207Before you faint due to vasovagal syncope, you may experience some of the following:
Pale skin
Lightheadedness
Tunnel vision — your field of vision narrows so that you see only what's in front of you
Nausea
Feeling warm
A cold, clammy sweat
Blurred vision
During a vasovagal syncope episode, bystanders may notice:
Jerky, abnormal movements
A slow, weak pulse
Dilated pupils
