What should you know about chronic hypertension in pregnancy?

Chronic hypertension is high blood pressure that existed before pregnancy or was identified early in pregnancy. It is different from hypertension that begins later, although the conditions can overlap. Blood pressure can be elevated without a noticeable feeling, so appointments may include repeated readings, urine checks, blood tests, and monitoring of the baby's growth and wellbeing. The care team watches for changes that could indicate preeclampsia or strain on organs such as the kidneys, heart, or brain.

Tell your obstetrician or midwife about every medicine, supplement, and previous pregnancy complication. Some blood-pressure medicines are not suitable in pregnancy, so do not stop, restart, or switch treatment without specialist advice. Keep a home-reading record if requested and attend antenatal checks even when you feel well. Rest, hydration, balanced meals, and activity advised for your pregnancy can support wellbeing, but they do not replace prescribed treatment. Ask how the care team will coordinate blood-pressure reviews, fetal monitoring, and planning for birth.

Contact your maternity unit urgently for a severe or persistent headache, visual changes, pain under the ribs or in the upper abdomen, sudden swelling of the face or hands, marked shortness of breath, vaginal bleeding, or reduced fetal movement. Do not wait for the next appointment if these occur. Emergency symptoms such as seizures, severe chest pain, collapse, or difficulty breathing require emergency services. These signs can occur with serious pregnancy complications, including preeclampsia, and need immediate assessment.

Ask which readings require a call, which medicines are appropriate, how often urine and blood tests are needed, and how the baby's growth will be followed. Discuss warning symptoms, safe activity, birth planning, and what monitoring may continue after delivery.