The reasons for the forehead veins are generally three: exercise, high blood pressure, strong heart contraction, emotional excitement: 1, because the perfusion pressure of the body tissues and organs is higher during exercise, so it causes more venous return, which will cause the forehead veins to burst. 2, high blood pressure, strong heart contraction, because of high blood pressure leads to high perfusion pressure, causing an increase in arterial blood supply. 3, when emotional excitement, due to breathing and the role of the heart will make the pressure in the veins increase, resulting in forehead veins, this situation, should be checked for blood pressure to exclude pathological phenomena.