Dear Madam,Vasovagal syncope
is the most common cause of fainting
. Vasovagal syncope occurs when your body overreacts to triggers, such as the sight of blood or extreme emotional distress. The trigger results in vasovagal syncope — a brief loss of consciousness
caused by a sudden drop in your heart rate
and blood pressure, which reduces blood flow to your brain.Vasovagal syncope is usually harmless and requires no treatment.
Vasovagal syncope occurs when the part of your nervous system that regulates heart rate and blood pressure malfunctions in response to a trigger, such as the sight of blood. Your heart rate slows, and the blood vessels in your legs widen. This allows blood to pool in your legs, which lowers your blood pressure. This drop in blood pressure and slowed heart rate quickly diminish blood flow to your brain, and you faint.
The cardiac system may not be at fault.