Pregnancy is a beautiful and challenging phase for many women. One of the most common health concerns during pregnancy is blood pressure fluctuations. While high blood pressure is often discussed, low blood pressure, or hypotension, can also cause discomfort and health risks for both the mother and the baby.
Low blood pressure, or hypotension, refers to abnormally low levels of blood flow throughout the body. During pregnancy, it's not uncommon for women to experience low blood pressure, particularly in the first and second trimesters. Though there is no clear cut defined value, it is arbitrarily defined as having a blood pressure reading lower than 90/60 mm Hg. While mild cases may not cause significant issues, more severe instances can have serious effects on both the mother and the baby.
This blog contains information about low blood pressure during pregnancy, its symptoms, risks, causes, and what you can do to manage it effectively. Please note that this blog is for informational purposes only, and it is always best to consult with the OB-GYN if you are experiencing low blood pressure in pregnancy.
Typical Blood Pressure Levels at Stages of Pregnancy
During pregnancy, a woman’s body undergoes significant changes, and blood pressure levels are no exception. The key to managing low blood pressure during pregnancy is understanding the symptoms and addressing any concerns promptly. Blood pressure can vary at different stages:
Blood pressure tends to drop in the early stages of pregnancy due to hormonal changes that dilate blood vessels, making it easier for the blood to circulate.
Blood pressure may remain lower than normal as the body adapts to the increased blood flow required to support the developing fetus.
Blood pressure typically stabilises, but extreme fluctuations or very low blood pressure can still pose a risk.
Symptoms of Low Blood Pressure in Pregnancy
Low blood pressure symptoms during pregnancy can indicate other medical conditions. Recognizing the symptoms of low blood pressure is crucial for early intervention. Get in touch with the OB-GYN if any of these symptoms persist or worsen. Common symptoms include:
What Causes Low Blood Pressure in Pregnancy?
There are various causes for low blood pressure during pregnancy, and understanding these can help manage the condition:
Early in pregnancy, hormones such as progesterone cause blood vessels to relax and dilate, which can lead to a drop in blood pressure.
Increased Blood Circulation
As the body adjusts to accommodate the growing fetus, blood circulation increases, potentially causing a temporary decrease in blood pressure.
Excessive vomiting, loose stools, and inadequate fluid intake can cause dehydration and reduce the volume of blood circulating through the body, which can contribute to low blood pressure.
A lack of essential vitamins and minerals, such as iron, can also contribute to low blood pressure.
The pressure of the gravid uterus on the inferior vena cava causes decreased venous return from lower limbs.
Standing up too quickly can cause a sudden drop in blood pressure, leading to dizziness or fainting.
When to Consult Doctor For Low Blood Pressure During Pregnancy?
It’s important to seek medical advice if you experience any of the following symptoms:
Persistent dizziness or fainting
Severe headaches or vision changes
Sudden weight gain or swelling in your hands and feet
Abnormal fatigue or weakness
Chest pain or shortness of breath
Low Diastolic Blood Pressure During Pregnancy
The diastolic reading in a blood pressure measurement is the lower number, which indicates the pressure in your arteries when your heart is resting between beats. Low diastolic blood pressure during pregnancy can sometimes be more concerning because it reflects a prolonged period of low blood flow to vital organs, including the brain and kidneys. Severe low diastolic blood pressure can lead to dizziness and fainting, increasing the risk of falls or other accidents.
Risks and Effects of Low BP in Pregnancy
While low blood pressure is often less talked about than high blood pressure, it can have significant consequences during pregnancy. Some of the potential risks and effects include:
Dizziness and fainting episodes caused by low blood pressure can lead to falls and injuries.
Reduced Blood Flow to the Placenta
Extremely low blood pressure can reduce blood flow to the placenta, which can affect the oxygen and nutrient supply to the baby.
In some cases, low blood pressure during pregnancy can increase the risk of preterm labor or delivery.
Insufficient blood flow to the baby can result in slower fetal growth, leading to a lower birth weight. Although, there isn’t enough evidence to corroborate this.
Diagnosis of Low Blood Pressure During Pregnancy
Diagnosing low blood pressure in pregnancy typically involves regular prenatal check-ups, during which the OB-GYN will measure your blood pressure using a sphygmomanometer (blood pressure cuff). If your blood pressure is consistently below 90/60 mm Hg, your doctor will monitor you more closely.
In some cases, additional tests such as blood tests and ultrasounds may be conducted to assess fetal well-being and ensure that there are no underlying complications.
Treatment For Low Blood Pressure in Pregnancy
While low BP in pregnancy is often managed with lifestyle changes and self-care strategies, some cases may require medical intervention. In rare cases, the doctor may prescribe medicines to alleviate any discomfort.
How to Raise Low Blood Pressure During Pregnancy?
For many women, lifestyle adjustments and self-care can help manage low blood pressure during pregnancy. Here are some helpful tips you should do if your blood pressure is low during pregnancy:
Eating a nutritious and balanced diet is vital for maintaining healthy blood pressure during pregnancy. Focus on foods rich in:
Iron: Low iron levels can contribute to anemia and low blood pressure. Include iron-rich foods like spinach, beans, and lean meats.
Salt: While too much salt can raise blood pressure, a moderate amount of salt can help boost blood volume and prevent drops in blood pressure.
Fluids: Drinking plenty of water helps maintain hydration and supports blood volume.
Frequent and small meals: Having small and frequent meals is crucial for maintaining overall body weight and healthy blood pressure.
Dehydration is a common cause of low blood pressure. Make sure to drink plenty of fluids throughout the day to prevent dehydration and help your body maintain a healthy blood pressure level.
Tight clothing can restrict blood flow and lead to a drop in blood pressure. Opt for loose, comfortable clothing to promote circulation and prevent dizziness.
Iron-rich foods or supplements help increase red blood cell production, improving oxygen delivery and stabilizing blood pressure. Ensuring adequate intake of iron, folic acid, and vitamin B12 supports overall maternal health, reduces fatigue, and minimizes the risks associated with anemia-related hypotension during pregnancy.
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Article by Dr. Renu Raina Sehgal
Chairperson - Obstetrics & Gynaecology
Artemis Hospitals
Frequently Asked Questions
Is 90/60 BP Normal in Pregnancy?
Yes, a blood pressure of 90/60 mmHg can be normal during pregnancy, especially in the first and second trimesters, as hormonal changes relax blood vessels. It is usually not a concern unless it causes symptoms like dizziness, fainting, or weakness.
Does Low Blood Pressure Affect Baby During Pregnancy?
Yes, low blood pressure can affect the baby if it causes reduced blood flow to the placenta. This may lead to complications such as low birth weight or preterm birth.
What Causes Low Blood Flow to Baby During Pregnancy?
Low blood flow to the baby can be caused by placental problems, high blood pressure or preeclampsia, maternal anemia, dehydration, smoking, poor nutrition, or conditions like diabetes that affect blood circulation.
What Causes Low Blood Pressure in Pregnancy Third Trimester?
Low blood pressure in the third trimester is commonly caused by dehydration, lying flat on the back (supine hypotensive syndrome), hormonal changes, anemia, prolonged standing, or inadequate fluid and salt intake.
Is Low Blood Pressure Dangerous During Pregnancy?
While mild low blood pressure may not pose a major risk, severe or prolonged hypotension can lead to complications such as fainting, placental insufficiency, and premature birth.
What should I do if my blood pressure is low during pregnancy?
Increasing fluid intake, eating small frequent meals, and getting up slowly can help prevent low blood pressure. In some cases, medications may be prescribed by the OB-GYN.
What is Considered Low Blood Pressure in Pregnancy?
A normal blood pressure range during pregnancy is typically between 90/60 mm Hg and 120/80 mm Hg. Anything lower than 90/60 mm Hg may be considered low blood pressure.
What Causes Low Diastolic Blood Pressure During Pregnancy?
Low diastolic blood pressure can be caused by hormonal changes, dehydration, nutritional deficiencies, or a reduction in blood volume.
When Should I Call the Doctor About Low Blood Pressure?
If you experience persistent dizziness, fainting, or any concerning symptoms, you should contact your OB-GYN.
What Foods Can Help with Low Blood Pressure During Pregnancy?
Iron-rich foods (e.g., spinach, lentils), salty snacks (in moderation), and hydrating fluids (water, coconut water) can help manage low blood pressure.
