Dr Advait Kulkarni (neurologist in Bengaluru) Fainting, or passing out, is referred to medically as a syncopal episode, or syncope. Syncopal episodes are typically triggered by a sudden, temporary drop in blood flow to the brain, which leads to loss of consciousness and muscle control. The person then falls down or over, which allows blood flow to return to the brain. Returning blood flow allows the person to regain consciousness. Symptoms and warning signs: Syncopal episodes are often preceded by warning signs or symptoms. These may include: • nausea • slurred speech • weak pulse • changes in body temperature that make you feel suddenly flushed or chilled • sudden, clammy sweat • pale skin • disturbances to your vision, like seeing spots, tunnel vision, blurry vision, or dilated pupils • feeling as if sounds are suddenly very far away • lightheadedness, wooziness, or feeling as if your head and body are weightless • numbness • dizziness • vertigo, or a sensation that the room is moving • rapid heartbeat • body weakness • shakiness • headache To know more click the link below http://www.dradvaitkulkarni.com