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).
Underlying causes of low blood pressure. 1  Low blood pressure can occur with: 2  Prolonged bed rest. 3  Pregnancy. During the first 24 weeks of pregnancy, itâs common for blood pressure to drop. 4  Decreases in blood volume. A decrease in blood volume can also cause blood pressure to drop.