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.
Abnormally low blood pressure may be associated with a number of different causes, such as: 1  vasovagal syncope (the common type of fainting brought on by stress or pain); 2  hypoaldosteronism (deficiency of a steroid hormone produced by the adrenal glands, as can occur with Addison's disease); and. 3  Parkinsonâs disease.