It's called Vasovagal syncope and it 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.

Yes. If a patient with syncope is mid-incident and is prevented from achieving a fully supine position, global cerebral hypoperfusion is extended, leading to an anoxic convulsion.

My sister has vasovagal syncope and she passes out if she is sitting or standing still too long. This started showing at a water park one time. I was with my friend, my mom, my dad, and my sister and we were standing in line for the first ride and all of a sudden my sister collapses on the ground and she couldn't hear or see anything. Later, she was diagnosed with vasovagal syncope. She also had it another time in the choir at church. We have been able to control it now and she hasn't had it since then.

A sudden loss of effective blood flow due to cardiac and/or peripheral vascular factors which may reverse spontaneously (e.g., neurocardiogenic syncope; vasovagal syncope) or only with interventions (e.g., cardiac arrest).

a vasovagal attack is a form of synope that results from abrupt emotional stress involving the vagus nerve's effect on blood vessels.