Women in pregnancy, the body are some changes, such as a significant proportion of pregnant women will appear dizziness, chest tightness and other conditions of low blood pressure, to the late can not, is the treatment of flat lying and other situations occur, low blood pressure during pregnancy some need timely treatment, otherwise there is a great health risks. What are the causes of low blood pressure during pregnancy? 1, low blood pressure in early pregnancy, may be due to pregnancy reaction, caused by nausea, vomiting, poor diet, will cause hypotension phenomenon; 2, with the growth of pregnancy week, the uterus gradually increased, supine, the increased uterus compression of the inferior vena cava, resulting in the inferior vena cava blood return obstruction, so that the amount of blood back to the heart sharply reduced, resulting in a corresponding reduction in cardiac output, resulting in a drop in blood pressure, this pregnancy This kind of supine hypotension generally happens to every pregnant woman, and it is normal now, so you don’t need to be too nervous and pay attention to avoid lying on your back when resting, so you will have less symptoms; 3, after the pregnant woman’s uterus increases, it will also compress the diaphragm, causing the vagus nerve to be excited, resulting in a slowed heartbeat and dilated heart vessels, resulting in lower blood pressure; 4, although the red blood cells keep growing during pregnancy, the growth of plasma in the blood is much higher than the growth of red blood cells. Therefore, the concentration of red blood cells and hemoglobin is relatively reduced, resulting in physiological anemia and insufficient blood volume, causing low blood pressure in pregnant women. If a pregnant woman has low blood pressure during pregnancy, she can exercise moderately and eat more iron and blood-supplementing foods to adjust the symptoms of low blood pressure.