Pregnancy and High Blood Pressure: What You Need to Know and How to Reduce or Prevent It

Pregnancy is a special period in a woman's life, but it also brings physical changes that can sometimes cause concern. One of these changes is an increased risk of high blood pressure during pregnancy. Many pregnant women worry about their blood pressure and its effects on both their own health and that of their baby. In this blog, we will discuss why you have a greater chance of high blood pressure during pregnancy, what it entails, what the causes and risk factors are, and how you can prevent or alleviate it.

What is high blood pressure during pregnancy?

High blood pressure, or hypertension, means that the pressure in your blood vessels is higher than normal. During pregnancy, this is usually defined as a blood pressure of 140/90 mmHg or higher. Although a mild increase in blood pressure may not pose an immediate threat in some cases, prolonged or severe hypertension can lead to complications for both the mother and the baby.

There are various forms of high blood pressure that can occur during pregnancy:

1. Chronic hypertension: This is a form of high blood pressure that is already present before pregnancy begins or is diagnosed before the 20th week of pregnancy. Women with chronic hypertension already experienced elevated blood pressure readings before pregnancy and often continue to experience them during pregnancy.
2. Gestational hypertension: This form of high blood pressure develops after the 20th week of pregnancy. It can be mild or severe and occurs in women who did not experience hypertension before pregnancy. This form of hypertension usually disappears after childbirth.
3. Pre-eclampsia: This is a serious complication that usually develops after the 20th week of pregnancy. It involves not only high blood pressure but also organ damage, often to the kidneys or liver. Pre-eclampsia can be life-threatening for both the mother and the baby if it is not recognized and treated in time.

Why is the chance of high blood pressure greater during pregnancy?

During pregnancy, your body undergoes many changes. One of the most important adaptations is that your blood volume increases to supply the growing baby with oxygen and nutrients. While your blood vessels usually adapt to this increased demand, in some cases this can lead to increased pressure on the walls of your blood vessels, resulting in higher blood pressure.

In addition, hormonal changes play a major role. Hormones such as progesterone help relax the muscles in the blood vessel walls, but sometimes the body does not respond well enough to these hormonal changes, causing an increase in blood pressure. Women who are already prone to hypertension before pregnancy have a greater chance of developing high blood pressure during pregnancy.

Causes and risk factors of high blood pressure during pregnancy

Although it is not always clear why some women develop high blood pressure during pregnancy, there are some known risk factors that increase the chance. These include:

1. Overweight or obesity: Women with a higher BMI have a greater risk of developing hypertension, both during and outside of pregnancy. Overweight can narrow blood vessels, increasing pressure.
2. Health problems before pregnancy: Women who already suffered from chronic hypertension, diabetes, kidney problems, or autoimmune diseases such as lupus before pregnancy have a higher risk of high blood pressure during pregnancy.
3. Previous pregnancy complications: Women who experienced gestational hypertension or pre-eclampsia in a previous pregnancy have an increased risk of experiencing it again in a subsequent pregnancy.
4. Age: Pregnant women over 35 years old are more likely to have high blood pressure during pregnancy.
5. Multiple pregnancies: If you are pregnant with twins or more, the chance of high blood pressure is greater because your body has to work extra hard to provide multiple babies with blood and nutrients.
6. Lifestyle: An unhealthy lifestyle, such as insufficient physical activity, smoking, and a diet high in salt and low in nutrients, can contribute to the development of hypertension.

Symptoms of high blood pressure during pregnancy

Often there are few or no symptoms of high blood pressure, which makes it difficult to recognize without regular measurements. That is why it is so important that you have your blood pressure checked regularly during prenatal appointments. In principle, the midwife checks your blood pressure at every prenatal appointment. If this is not the case, be sure to speak up. In some cases, however, women may experience symptoms, including:

• Severe headache that does not disappear with rest or medication.
• Blurred vision or other visual changes such as flashing lights or sensitivity to light.
• Pain in the upper abdomen, often on the right side, under the ribs.
• Nausea or vomiting, especially in the second half of pregnancy.
• Sudden swelling of hands, feet or face.
• Shortness of breath or chest pain.

If you experience any of these symptoms, it is important to contact your doctor or midwife immediately, as these may be signs of pre-eclampsia.

How can you prevent high blood pressure during pregnancy?

Although you cannot always prevent developing high blood pressure during pregnancy, there are steps you can take to reduce the risk or keep blood pressure under control.

1. Eat a healthy and balanced diet
   Nutrition plays a large role in regulating your blood pressure. Make sure your diet is rich in fresh vegetables, fruits, whole grains, and lean proteins. Avoid excessive salt, processed foods, and foods high in added sugars, as these can raise blood pressure.
2. Stay active
   Regular exercise can help keep blood pressure at a healthy level. Activities such as walking, swimming, or prenatal yoga are safe and promote circulation. Always consult your healthcare provider before starting a new exercise regimen, especially if you already suffer from hypertension.
3. Avoid stress
   Stress can contribute to an increase in your blood pressure, so try activities that help you relax, such as meditation, breathing exercises, reading, or enjoying quiet walks in nature. Also get enough sleep, as sleep deprivation can increase blood pressure.
4. Limit caffeine
   Although small amounts of caffeine are usually not a problem during pregnancy, excessive caffeine intake can contribute to high blood pressure. 
5. Drink enough water
   Dehydration can contribute to an increase in blood pressure, so make sure you drink enough water throughout the day. Aim for at least 1.5 to 2 liters of water per day, unless your doctor advises otherwise.
6. Prenatal check-ups
   Regular prenatal check-ups are crucial to monitor your blood pressure and intervene early if problems arise. Follow your midwife's advice and do not hesitate to ask questions if you are concerned.

How is high blood pressure treated during pregnancy?

If your blood pressure is too high, your doctor or midwife will monitor you closely. In some cases, it may be necessary to prescribe blood pressure-lowering medication. These medications are safe during pregnancy and help to keep blood pressure under control to prevent complications.

In severe cases, such as with pre-eclampsia, hospitalization may be necessary to monitor both you and your baby closely. In rare cases, it may be necessary to induce labor early to prevent complications.

What does high blood pressure mean for you and your baby?

While it can be alarming to hear that you have high blood pressure, it is important to know that most women with gestational hypertension or pre-eclampsia have a healthy baby, especially if the condition is detected early and treated properly.

It is also reassuring that many cases of high blood pressure disappear after childbirth, especially if it concerns gestational hypertension. However, you will still be followed for some time after childbirth to ensure that your blood pressure returns to a normal level. In short, high blood pressure during pregnancy is not immediately "bad". It is important that you monitor it closely with your midwife so that you can intervene in time if necessary.