Why does? impending heart attacks cause excessive sweating on the forehead?

Signs: Heart Attack: One of the most common symptoms of an acute heart attack is diaphoresis or excessive sweating. The other common symptoms include chest pain, numbness extending into the jaw and left arm, and nausea. That is for a man. Women may have less obvious symptoms and should be even more aware if there appears to be something wrong. But, yes excessive and acute sweating is part of the syndrome.