What Causes Low Blood Pressure During Pregnancy?

After becoming pregnant, women routinely undergo blood pressure monitoring. In some cases, low blood pressure (hypotension) is detected during these routine checks. What causes hypotension during pregnancy?

Causes of Hypotension During Pregnancy

Common causes of pregnancy-related hypotension include maternal malnutrition during pregnancy, pre-pregnancy hypotension, and orthostatic hypotension. During early pregnancy, severe morning sickness may prevent women from eating regularly and cause pronounced nausea and vomiting, leading to dehydration—thus increasing the risk of hypotension in the first trimester. Women with pre-existing low blood pressure may experience exacerbated hypotension during pregnancy, as mother and fetus share a single circulatory system. In late pregnancy, progressive uterine enlargement exerts pressure on the veins of the lower extremities, predisposing women to orthostatic hypotension.

Once the underlying cause of hypotension has been identified, pregnant women should actively cooperate with their healthcare providers to address the root cause and restore blood pressure to normal levels as soon as possible. Throughout pregnancy, women must ensure adequate nutritional intake. For those experiencing severe morning sickness, intravenous nutritional supplementation may be recommended to meet fetal growth and developmental requirements and help prevent pregnancy-associated hypotension.

Untreated chronic hypotension during pregnancy can significantly impair fetal development. Therefore, upon diagnosis of hypotension, not only should blood pressure be actively managed, but fetal development must also be closely monitored. We hope this information proves helpful!