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 medical conditions can cause low blood pressure. These include: 1  Pregnancy. 2  Because a woman's circulatory system expands rapidly during pregnancy, blood pressure is likely to drop. 3  This is normal, and blood pressure usually returns to your pre-pregnancy level after you've given birth.
For example, low blood volume due to bleeding (such as a bleeding ulcer in the stomach or from a severe laceration from an injury) can cause low blood pressure. The heart rate increases and the forcefulness of the heart's contractions increase thus pumping more blood through the heart.