Why do pregnant women faint?

After pregnancy, the patient's body and mood will change. Just after pregnancy, emotional tension, anxiety, worry about things more, they will show symptoms of vasoconstriction. Secondly, after pregnancy, the whole body blood will flow to the position of the uterus to nourish the fetus, causing peripheral blood to show a relative deficiency. At this time, if the pregnant woman changes position, such as sudden rise or emotional tension, its vasoconstriction changes, blood flow will show dizziness, faint performance.