Low blood pressure during pregnancy is mostly caused by the enlarged uterus of pregnant women, supine syndrome, changes in body position, etc. In addition to the treatment of the cause of the treatment, it is also necessary to pay attention to the daily regimen, and medication can be used if necessary. 1, uterine enlargement: the enlarged uterus during pregnancy will compress the diaphragm, slowing down the heartbeat, while the heart blood vessels dilate, which can lead to a drop in blood pressure. 2, supine syndrome: with the growing fetus baby, the pregnant mother lying on her back As the baby continues to grow, when the pregnant mother lies on her back, the enlarged uterus presses on the inferior vena cava, blocking the return of blood to the pelvis and the inferior vena cava, resulting in a rapid decline in cardiac output and a consequent decrease in blood pressure. It is recommended that pregnant women take the left side position when sleeping, so that the forward curvature of the lumbar spine is reduced, in order to prevent low blood pressure; 3. Changes in body position: when changing from sitting, kneeling, squatting to standing, if the speed is too fast, the blood will leave the brain due to gravity, resulting in a drop in blood pressure. It is recommended to get up slowly in sitting position, which can avoid postural hypotension. Pregnant women should avoid excessive sweating, excessive consumption of sweets, overwork before going to bed, and should not lie down in bed immediately after activities, not to mention lying on the back. If you go out, it is recommended to be accompanied by family members or friends, and avoid activities alone, so as to avoid sudden low blood pressure leading to fainting and falling.