What should you know about hypertension in pregnancy?

Your maternity or medical team may check blood pressure and urine, ask about symptoms, arrange blood tests, and monitor your baby's growth. The plan depends on when high blood pressure started, how high it is, whether there are signs of pre-eclampsia, and how you and your baby are doing.

Hypertension means blood pressure is higher than the range your clinical team considers safe. It may have been present before pregnancy, begin during pregnancy, or continue after birth. High blood pressure alone does not confirm pre-eclampsia; clinicians look for associated changes, such as protein in the urine or problems affecting organs or the placenta.

Some people have no warning symptoms. Monitoring is therefore useful even if you feel normal. A reading can vary with rest, movement, stress and the way the cuff is fitted, so your team may repeat it or ask you to check it at home using an agreed method.

Attend the blood-pressure, urine and antenatal appointments recommended for you, and take prescribed medicine exactly as directed. Do not stop or change a blood-pressure medicine without speaking with your maternity or prescribing team, because pregnancy and breastfeeding can affect which medicines are suitable.

Keep a record of home readings if your team has asked you to monitor them, including when each reading was taken and any symptoms. Bring the monitor to an appointment if its accuracy needs checking. Ask how activity, salt, other medicines and supplements fit into your personal plan; avoid self-treating with over-the-counter products.

Contact your maternity assessment service urgently for a severe or persistent headache, vision changes, severe pain below the ribs, sudden swelling of the face or hands, vomiting that feels unusual for you, breathlessness, chest pain, confusion, or feeling markedly unwell. These symptoms can need prompt assessment for pre-eclampsia or another serious problem.

Seek emergency help for collapse, a seizure, severe difficulty breathing, or sudden weakness or trouble speaking. If a home reading is higher than the limit your team gave you, follow their instructions immediately; do not wait for the next routine appointment.

Ask which type of hypertension you have, what blood-pressure range should prompt a call, and whether you need home monitoring. You can also ask which tests will assess your kidneys, liver, blood cells, urine and baby's growth, how often appointments are needed, and how the condition may affect your birth plan and care after delivery.