What causes low blood pressure during pregnancy

Low blood pressure during pregnancy may be caused by changes in pregnancy hormones, increased blood volume, malnutrition, orthostatic hypotension, anemia, and other factors.

1. Changes in pregnancy hormones:

Elevated progesterone levels in early pregnancy can dilate blood vessels and reduce peripheral vascular resistance. Although this physiological regulation helps with placental blood flow perfusion, it may cause a decrease in systolic blood pressure of 10-20mmHg, which is common between 8-12 weeks of pregnancy and is usually accompanied by mild symptoms such as dizziness and fatigue.

2. Increased blood volume: During pregnancy, blood volume can increase by 40% -50%, and plasma dilution leads to a relative decrease in hemoglobin concentration. This compensatory change is most pronounced in mid pregnancy and may cause a 5-10mmHg decrease in blood pressure compared to pre pregnancy, which is a normal physiological phenomenon during pregnancy. 3. Malnutrition: Insufficient intake of nutrients such as iron, folate, and vitamin B12 during pregnancy can affect red blood cell production. Lack of sodium ions may also lead to insufficient blood volume. It is recommended to consume no less than 5g of salt per day, while ensuring the intake of high-quality protein and dark vegetables.

4. Positional hypotension:

The enlarged uterus compresses the inferior vena cava, and blood reflux decreases when standing suddenly. It is recommended to move slowly when changing positions and sleep in a left lateral position to avoid prolonged standing. If there is blackening in front of your eyes, sit down immediately to prevent falling.

3. Anemia factors:

Iron deficiency anemia can reduce the oxygen carrying capacity of the blood and worsen symptoms of low blood pressure. If the hemoglobin level during pregnancy is below 110g/L, intervention is needed. It is recommended to increase the intake of foods rich in heme iron, such as animal liver and red meat, in moderation. If necessary, iron supplements should be supplemented under the guidance of a doctor.

It is recommended that pregnant women drink small amounts of water 5-6 times a day, with a total intake of about 2000ml, to avoid diluting blood with large amounts of water at once. Moderate low-intensity exercises such as yoga and walking for pregnant women can promote blood circulation. It is recommended to measure blood pressure at a fixed time and choose to rest in a sitting position for 15 minutes before proceeding. If the systolic blood pressure remains below 90mmHg or severe symptoms such as blurred vision and consciousness occur, timely medical attention should be sought to rule out gestational cardiovascular disease. Healthy snacks such as nuts and whole wheat biscuits can be prepared in daily life to prevent blood pressure fluctuations caused by low blood sugar before meals.