Why Is My Blood Pressure Low?


Quick Answer

Low blood pressure can occur with pregnancy, the use of certain medications or a decrease in blood volume, according to the American Heart Association. However, as long as the symptoms are not bothersome, low blood pressure is not a cause for concern.

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Full Answer

When a woman becomes pregnant, her circulatory system expands rapidly, according to Mayo Clinic. This rapid expansion causes some women to experience low blood pressure. For most women, this drop in blood pressure is normal and the readings return to normal once the baby is born.

Medications designed to lower blood pressure and some medications used for other purposes can cause low blood pressure, according to WebMD. These medications are often associated with postural hypotension. When a person takes these pills and changes his position from sitting to standing, his blood pressure drops suddenly, causing him to become dizzy. If the dizziness is significant, the individual could lose his balance and fall.

A loss of blood volume might also lead to low blood pressure, according to the American Heart Association. Dehydration, internal bleeding and external bleeding from trauma all lower the volume of blood in the circulatory system. The underlying symptoms for a loss of blood volume are often serious conditions that lead to further complications without treatment.

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