There are many factors that can cause this phenomenon and it is not rare, unfortunately. Most of the time is is a physiological problem emanating from your immune system, believe it or not. Your body sees the fetus as a threat and begins to ramp up for a fight. This drives the blood pressure upward. Another problem can be an undetected infection, another can be a simple magnesium deficiency. There are so many things that in and of themselves are not a major problem, although can manifest themselves in other ways as a problem, that it is really hard to tell.

I suggest that if you should decide to become pregnant again that you go to a natural health practitioner in your area and see what they have to say. As a matter of course, however, I suggest you might want to begin taking calcium, magnesium and vitamin D. Both calcium and magnesium deficiencies can prompt high blood pressure.