Pregnancy-Induced Hypertension

Overview

Pregnancy-induced hypertension, also called gestational hypertension, is high blood pressure that first develops after the 20th week of pregnancy in a woman whose blood pressure was previously normal. Unlike chronic hypertension, which is present before pregnancy, this form arises during pregnancy and usually resolves after delivery.

While many women with gestational hypertension have healthy pregnancies, the condition needs close monitoring because it can progress to preeclampsia, a more serious condition involving high blood pressure and signs of organ stress. Recognizing warning signs and attending regular prenatal care help protect both mother and baby.

Symptoms

Gestational hypertension often causes no symptoms and is found during routine prenatal blood pressure checks. When symptoms occur, or when it progresses toward preeclampsia, they may include:

• Headaches, sometimes severe
• Changes in vision, such as blurring, spots, or sensitivity to light
• Swelling of the face, hands, or feet (some swelling is normal in pregnancy)
• Pain in the upper abdomen, often on the right side
• Sudden weight gain
• Nausea or vomiting later in pregnancy

Seek urgent care for a severe headache that will not go away, vision changes, upper belly pain, or sudden swelling, as these can signal preeclampsia.

Causes

The exact cause of pregnancy-induced hypertension is not fully understood. It is thought to involve changes in the blood vessels and the way the placenta develops and supplies blood. Several factors are associated with a higher chance of developing it:

• First pregnancy or a new partner since a previous pregnancy.
• Carrying more than one baby (twins or more).
• Older maternal age or obesity.
• A personal or family history of gestational hypertension or preeclampsia.
• Pre-existing conditions such as diabetes, kidney disease, or chronic high blood pressure.

It is not caused by anything the mother did wrong, and it can occur even in healthy women.

Risk Factors

• First pregnancy
• Twin or multiple pregnancy
• Personal or family history of preeclampsia or gestational hypertension
• Obesity
• Age over 35 (or very young age)
• Pre-existing diabetes, kidney disease, or chronic hypertension
• Certain autoimmune conditions

Diagnosis

Diagnosis is based on repeated blood pressure measurements during prenatal care.

• Blood pressure monitoring: Elevated readings after 20 weeks of pregnancy, confirmed on more than one occasion.
• Urine tests: To check for protein, which would suggest progression to preeclampsia.
• Blood tests: To assess kidney and liver function and platelet counts.
• Fetal monitoring: Ultrasound and other checks to ensure the baby is growing and doing well.

Gestational hypertension is high blood pressure without the signs of organ involvement that define preeclampsia, so ongoing testing watches for that change.

Treatment

Management depends on how high the blood pressure is, how far along the pregnancy is, and whether preeclampsia develops.

• Close monitoring: More frequent prenatal visits, blood pressure checks, urine and blood tests, and monitoring of the baby.
• Blood pressure medication: Certain medicines that are considered safe in pregnancy may be used for higher blood pressure.
• Rest and lifestyle measures: As advised by the care team.
• Timing of delivery: If the condition worsens or preeclampsia develops, delivering the baby is the definitive treatment; the timing balances the health of mother and baby.

Blood pressure usually returns to normal after delivery, though it should be monitored in the postpartum period.

Prevention

• Attend all prenatal appointments so blood pressure is checked regularly
• Discuss your risk factors with your care provider early in pregnancy
• Take low-dose aspirin if recommended by your clinician for higher-risk pregnancies
• Maintain a healthy weight before and during pregnancy as advised
• Manage pre-existing conditions such as diabetes and chronic hypertension
• Report headaches, vision changes, or sudden swelling promptly

When to See a Doctor

Keep all prenatal appointments, and contact your provider promptly if you have new or worsening symptoms. Seek urgent or emergency care during pregnancy for:

• A severe or persistent headache
• Vision changes such as blurring, flashing lights, or spots
• Pain in the upper abdomen, especially on the right side
• Sudden swelling of the face and hands or rapid weight gain
• Decreased baby movements, or a seizure (call emergency services)

Related Topics

Frequently Asked Questions

References

1. American College of Obstetricians and Gynecologists (ACOG). Preeclampsia and High Blood Pressure During Pregnancy.
2. Mayo Clinic. High blood pressure and pregnancy.
3. MedlinePlus, U.S. National Library of Medicine. High blood pressure in pregnancy.