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This topic is about high blood pressure that some women get while they are pregnant. For information about preeclampsia, a more serious kind of high blood pressure, see the topic Preeclampsia .

What is high blood pressure?

Blood pressure is a measure of how hard your blood pushes against the walls of your arteries. If the force is too hard, you have high blood pressure (also called hypertension).

Blood pressure is shown as two numbers. The top number ( systolic ) is the pressure when the heart pumps blood. The bottom number ( diastolic ) is the pressure when the heart relaxes and fills with blood.

Blood pressure is high if the top number is 130 or higher or if the bottom number is 80 or higher.

Blood pressure during pregnancy

Normally, a woman's blood pressure drops during her second trimester . Then it returns to normal by the end of the pregnancy.

But some women have high blood pressure while they are pregnant. They may have:

• High blood pressure that started before pregnancy. This is called chronic high blood pressure. It usually doesn't go away after the baby is born.
• Very high blood pressure that starts in the second or third trimester. This is called gestational hypertension. It usually goes away after the baby is born.

Sometimes high blood pressure during pregnancy is a first sign of preeclampsia . This condition can be dangerous for both mother and baby.

Having high blood pressure during pregnancy doesn't mean that you will get preeclampsia. But it does mean that you need to have your blood pressure checked often. And you may need treatment.

Why is high blood pressure during pregnancy a concern?

If your blood pressure is very high, it could keep your baby from getting enough blood and oxygen. This could limit your baby's growth, or it could cause the placenta to pull away from the uterus too soon. (This is called placenta abruptio .) It also could lead to stillbirth.

What are the symptoms?

High blood pressure usually doesn't cause symptoms. You will probably feel fine, even if your blood pressure is too high.

Tell your doctor right away if you have any signs of very high blood pressure or preeclampsia, such as:

• A severe headache.
• Blurry vision.
• Pain in your upper belly.
• Rapid weight gain-more than 2 lb (0.9 kg) in a week or 6 lb (2.7 kg) in a month.

How is high blood pressure diagnosed?

High blood pressure is usually found during a prenatal visit. This is one reason it's so important to go to all of your prenatal checkups.

At each prenatal visit, your doctor, nurse, or midwife will:

• Check your blood pressure. A sudden increase in blood pressure often is the first sign of a problem.
• Test your urine for protein. Too much protein in the urine is a sign of kidney damage caused by preeclampsia.
• Check your weight. Rapid weight gain can be a sign of preeclampsia.

If you have high blood pressure while you're pregnant, you will have regular tests to check your baby's health. These may include:

• Electronic fetal heart monitoring. This records your baby's heart rate.
• Fetal ultrasound. This test is done to check on your baby, the placenta, and the amount of amniotic fluid.
• Doppler ultrasound. This checks how well the placenta is working.

If your doctor thinks you are at high risk for preeclampsia, you may have other tests, including:

• Blood tests to check for problems such as kidney damage.
• A creatinine clearance test to check your kidney function.

How is it treated?

You may need to take medicine if your doctor thinks your blood pressure is too high. Medicines used to treat high blood pressure during pregnancy include methyldopa and nifedipine.

Some common blood pressure medicines are not safe during pregnancy. If you take medicine for chronic high blood pressure:

• Talk to your doctor about the safety of your medicine before you become pregnant or as soon as you learn you are pregnant.
• Be sure that your doctor has a complete list of all the medicines you take.

To reduce your risk for preeclampsia, your doctor may recommend that you take low-dose aspirin during the second and third trimesters of your pregnancy.

What can you do to take care of yourself?

To help control your blood pressure and have a healthy pregnancy:

• Be sure to go to all of your prenatal checkups so your doctor or midwife can check your blood pressure. You may also want to check your blood pressure at home.
• Don't smoke. This is one of the best things you can do to lower your blood pressure and to help your baby be healthy. If you need help to quit smoking, talk to your doctor.
• Gain an amount of weight that is healthy for you. Your doctor or midwife can help you set a pregnancy weight goal.
• If your doctor says it's okay, get regular exercise during pregnancy. Walking or swimming several times a week can help lower blood pressure. And it's good for you and your baby.
• Try to keep your stress level low. This may be hard to do, especially if you continue to work, have young children, or have a hectic schedule. But try to find some time to relax.

Frequently Asked Questions

Learning about high blood pressure during pregnancy:	What is high blood pressure during pregnancy? What should I know about chronic high blood pressure during pregnancy? What is preeclampsia? When is swelling a sign of preeclampsia?
Being diagnosed:	How are urine tests done? What is a creatinine clearance test? How is electronic fetal heart monitoring done? How is fetal ultrasound done? What is Doppler ultrasound? What blood tests are done to look for preeclampsia?
Taking care of yourself:	What questions do I need to ask my doctor about high blood pressure during pregnancy? What can I do to stay healthy during my pregnancy? How can I quit smoking during pregnancy? How can I check my blood pressure at home?