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.
1 Dehydration can sometimes cause blood pressure to drop. 2  However, dehydration does not automatically signal low blood pressure. 3  Fever, vomiting, severe diarrhea, overuse of diuretics and strenuous exercise can all lead to dehydration, a potentially serious condition in which your body loses more water than you take in.
In addition, dehydration, diabetes, and certain heart problems like arrhythmias can cause low blood pressure. One specific type of low blood pressure is orthostatic hypotension. It occurs following a sudden change in body position, most often from lying down to standing, although sometimes sitting up after lying down, or just bending over to pick something off the floor while standing can trigger it.