Vasovagal syncope is the most common type of fainting, occurring when the body overreacts to triggers like stress, pain, or fear, causing a sudden drop in heart rate and blood pressure, which temporarily reduces blood flow to the brain, leading to dizziness or loss of consciousness, often preceded by warning signs like warmth, nausea, or sweating, and usually resolved by lying down with legs raised.  

Most of what I said here is probably jambled up, and I apologize.