A stroke can come on quickly, and if you don't act fast, it could be fatal. That's why it is important to know the signs and symptoms to watch out for, especially if you or someone you love is at a higher risk. Stroke Neurologist with University of Utah Healthcare, Dr. Peter Tekiela, shares what the acronym FAST stands for. He shares what to do if you notice any of these signs, and who is at a higher risk of stroke.