What to know about chronic gestational hypertension

The timing of the first high readings helps your maternity team classify the condition. Chronic hypertension is present before pregnancy or appears in its earlier part. Gestational hypertension develops later in someone whose blood pressure was previously normal. If high blood pressure continues after birth, the team may reassess whether it is chronic hypertension.

High blood pressure often causes no noticeable symptoms. It can place extra strain on the heart and kidneys and may reduce blood flow through the placenta. It can also occur with pre-eclampsia, which involves signs that organs are being affected and can develop during pregnancy or after delivery.

Keep every planned antenatal appointment, even when you feel well. Your care team may repeat blood-pressure measurements, ask you to check readings at home, test urine and blood, and arrange ultrasound or other checks of the baby's growth and wellbeing. Record home readings exactly as instructed and bring the log and your medicines to appointments.

Take prescribed blood-pressure medicine as directed. Do not stop, restart, or change a dose on your own, because some medicines need review during pregnancy and breastfeeding. Ask before taking aspirin, anti-inflammatory painkillers, herbal remedies, or supplements. The timing and place of birth depend on your readings, test results, symptoms, and the baby's condition.

Contact your maternity unit urgently for a severe or persistent headache, blurred vision or flashing lights, strong pain under the ribs, sudden swelling of the face or hands, vomiting later in pregnancy, trouble breathing, or noticeably reduced baby movements. These warning signs need assessment for pre-eclampsia or another pregnancy problem, regardless of how well you felt earlier.

Call emergency services for a seizure, collapse, severe difficulty breathing, chest pain, or stroke-like symptoms such as facial drooping, arm weakness, or difficulty speaking. Warning signs can begin after delivery, so seek urgent help during the postnatal period as well.

Ask which diagnosis applies to you, what home reading should prompt a call, and how to use and check your monitor. Clarify which symptoms require the maternity unit or emergency services, whether your medicines are suitable for pregnancy and breastfeeding, how the baby will be monitored, and when your blood pressure should be reviewed after birth.