Gestational hypertension

Overview

Gestational hypertension is high blood pressure that happens for the first time during pregnancy, usually after the 20th week. It is not the same as chronic high blood pressure, which you might have had before becoming pregnant. In most cases, it goes away after the baby is born, but it needs careful monitoring to prevent complications.

Yes, gestational hypertension is fairly common. It affects around 5 to 8 out of every 100 pregnant women.

Gestational hypertension can affect any pregnant woman, but it is more common in first pregnancies, women carrying twins or more, women over 35, and those with a family history of high blood pressure or pre-eclampsia.

Symptoms

Common symptoms

• Often there are no symptoms — many women only find out during a routine blood pressure check.
• Mild swelling in the hands, feet, or face (though some swelling is normal in pregnancy).
• Persistent headache that does not go away with rest or usual remedies.

Causes

Main causes

• The exact cause is not fully understood, but it is thought to be related to how the placenta develops and works.
• Genetic factors can play a role — it runs in some families.

Risk factors

• First pregnancy.
• Carrying more than one baby (twins, triplets).
• Maternal age over 35.
• Obesity (having a body mass index over 30 before pregnancy).
• Personal or family history of high blood pressure or pre-eclampsia.
• Pre-existing conditions such as diabetes or kidney disease.

When to see a doctor

See a doctor urgently if:

• If you notice any of the emergency symptoms listed above, call emergency services right away.
• If you have severe headache, vision changes, or pain under your ribs, see a doctor immediately.

Book a routine appointment if:

• Attend all your scheduled prenatal check-ups — blood pressure is measured at every visit.
• If you have been diagnosed with gestational hypertension, your doctor will want to monitor you more often, sometimes weekly or twice a week.

Diagnosis

Gestational hypertension is diagnosed when your blood pressure is consistently higher than 140/90 mmHg after 20 weeks of pregnancy, and you did not have high blood pressure before pregnancy. Your doctor will also check for protein in your urine to rule out pre-eclampsia.

Tests that may be done

• Blood pressure measurement at each prenatal visit.
• Urine test to check for protein (a sign of pre-eclampsia).
• Blood tests to assess your kidney and liver function, and to check your platelet count.
• An ultrasound scan to check the baby's growth and the amount of amniotic fluid.

What to expect at your appointment

If you are diagnosed with gestational hypertension, your doctor will likely ask you to come in for more frequent check-ups. They will monitor your blood pressure, urine, and blood work. You may also have extra ultrasound scans to make sure your baby is growing well. In most cases, you will not need to stay in the hospital unless your blood pressure is very high or there are signs of pre-eclampsia.

Treatment

Treatment focuses on keeping your blood pressure controlled to protect you and your baby. The main plan is close monitoring and, if needed, medication to lower blood pressure. The goal is to get you safely to term (37 weeks or later) if possible. Delivery of the baby is the only 'cure' for gestational hypertension, but it is usually managed until it is safe to deliver.

Self-care at home

• Rest as much as possible — your doctor may suggest reducing your activity level.
• Avoid lying flat on your back; lie on your side instead to improve blood flow.
• Check your blood pressure at home if your doctor advises it.
• Keep a diary of your symptoms and blood pressure readings to share with your care team.

Medical treatments

If your blood pressure is very high, your doctor may prescribe antihypertensive medication (blood pressure pills) that are safe to take in pregnancy. Never take any medication without your doctor's advice. In hospital, you may receive IV medication if your blood pressure is dangerously high. Your doctor will decide the best time and method of delivery (natural or cesarean) based on your condition and how far along your pregnancy is.

When is surgery considered?

Most women with gestational hypertension deliver vaginally, but if there are concerns for you or the baby, a planned cesarean section may be recommended. This is a decision your healthcare team will make with you.

Living with this condition

Living with gestational hypertension means making some adjustments to your daily routine. You will need regular check-ups and possibly home blood pressure monitoring. It is important to listen to your body and rest when you feel tired. Most women can continue their usual activities as long as they avoid heavy lifting and excessive stress.

Lifestyle tips

• Get plenty of rest — aim for at least 8 hours of sleep at night and short naps during the day if possible.
• Avoid standing for long periods.
• Stay hydrated by drinking water throughout the day.
• Reduce salt in your diet — avoid processed and salty foods.
• Avoid alcohol and smoking completely during pregnancy.

Diet and exercise

Eat a balanced diet rich in fruits, vegetables, whole grains, and lean protein. Cutting back on salt can help control blood pressure. Gentle exercise like walking or swimming is usually safe, but check with your doctor first. Avoid strenuous activities or heavy lifting.

Mental health and emotional wellbeing

Being diagnosed with a condition during pregnancy can be stressful. You may feel anxious, worried, or frustrated. These feelings are normal. Talk to your partner, family, or a friend about how you feel. Your midwife or doctor can also refer you to a counsellor if needed.

Prevention

There is no sure way to prevent gestational hypertension, but you can reduce your risk by maintaining a healthy weight before pregnancy, eating well, and staying physically active. If you have risk factors, your doctor may suggest low-dose aspirin starting early in pregnancy to reduce the chance of developing pre-eclampsia (but always follow your doctor's advice and never take aspirin without medical guidance).

Vaccines

No vaccine is available for gestational hypertension. Staying up to date with routine vaccinations (like flu and whooping cough) during pregnancy is generally safe and recommended.

Screening programmes

Blood pressure is measured at every prenatal visit as part of routine screening. If you have high blood pressure, your doctor will also check your urine for protein. This is a simple and effective way to catch the condition early.

Complications

If left untreated

• Gestational hypertension can progress to pre-eclampsia, a more serious condition that can affect your organs and the placenta.
• It can lead to poor growth of the baby (called intrauterine growth restriction or IUGR).
• In severe cases, it can lead to placental abruption (where the placenta separates from the womb too early).
• It may increase the risk of preterm birth (baby born before 37 weeks).

Long-term outlook

With proper monitoring and treatment, the outlook for women with gestational hypertension is very good. Most women go on to have healthy babies. After delivery, blood pressure usually returns to normal within a few weeks. A small number of women may continue to have high blood pressure after pregnancy and need ongoing care, but this is uncommon. Your healthcare team will work with you to ensure the best outcome for you and your baby.

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