Source: UNC Health Talk. Strokes can be tricky: They tend to come without warning and don’t announce themselves like other types of illnesses. “Humans’ usual way of sensing danger is pain, and unfortunately most strokes don’t come with pain,” says David Y. Huang, MD, PhD, neurologist and director of UNC Hospitals Comprehensive Stroke Center. So how do you know when to head to the emergency department? The acronym BE FAST—loss of Balance, Eyes (loss of vision or double vision), Facial…