This was not a smooth process. The rise of executive power sometimes hurt important interests and always rubbed against the republican sensibilities that Americans inherited from the founders. From time to time, Congress reaped political benefits from thwarting the president. But today Congress reacts rather than leads.
Some of the causes of low blood pressure include: 1  Getting up after you sit or lie down. 2  This can cause a quick drop in blood pressure called orthostatic hypotension. 3  Standing for a long time. 4  Not drinking enough fluids (dehydration).
Low Blood Pressure and the Heart. The heart is a muscle that works as a pump and is controlled by electrical signals. Problems with either the pump or the electricity can cause problems with low blood pressure. 1  If the heart beats too quickly, blood pressure may fall because there isn't enough time for the heart to refill in between each beat (diastole).