Understanding Blood Pressure During Pregnancy

Blood pressure is one of the first things your doctor checks at every prenatal visit — and for good reason. It tells how well your body is coping with the extra blood flow and changes of pregnancy.

If you’ve ever wondered what’s normal, what’s not, and how to keep it steady, here’s a simple guide to understanding blood pressure during pregnancy.

What’s a Normal Blood Pressure in Pregnancy?

In most pregnancies, blood pressure stays close to what’s normal for you — around 120/80 mmHg. A little higher or lower is usually fine.

Your doctor may start paying closer attention if:

• The top number (systolic) goes above 140, or
• The bottom number (diastolic) goes above 90.

This can indicate high blood pressure (hypertension), which sometimes leads to preeclampsia — a condition that needs medical care.

If your blood pressure drops too low (for example, below 90/60), you might feel dizzy, weak, or lightheaded. That’s called low blood pressure (hypotension) and can also make you feel uncomfortable.

Why Does Blood Pressure Change During Pregnancy?

Blood pressure naturally changes throughout pregnancy. Your body produces more blood, and your hormones relax your blood vessels to help carry nutrients to the baby.

Here’s what’s typical:

• Early pregnancy: BP may drop a little, and you might feel more tired or dizzy.
• Mid-pregnancy: It usually stays lower or returns to your usual level.
• Late pregnancy: BP can rise slightly again as your heart works harder — but should stay within a safe range.

That’s why your doctor checks BP at every appointment — just to make sure it’s staying healthy.

How to Keep Your Blood Pressure Healthy

You can’t always control every change, but you can support your body by:

• Eating balanced meals: Include fresh fruits, vegetables, and avoid too much salt.
• Drinking enough water: Staying hydrated helps blood flow.
• Moving gently: Walks or prenatal yoga support circulation.
• Resting often: Lying on your left side improves blood flow to your baby.
• Managing stress: Deep breathing or quiet time helps calm your body.
• Keeping up with checkups: Regular monitoring helps detect any changes early.

If your doctor recommends medication or extra monitoring, follow their advice closely.

Pregnancy Blood Pressure Red Flags 

Contact your doctor if you:

• Notice readings above 140/90 or below 90/60
• Have headaches that don’t go away
• See flashing lights or blurred vision
• Experience sudden swelling in hands, face, or feet
• Feel upper abdominal pain or dizziness

Even small changes matter in pregnancy — it’s always best to get checked.

The Takeaway

Blood pressure changes are normal during pregnancy, but regular checkups keep you safe. With rest, hydration, and mindful care, most moms maintain healthy BP levels. Staying informed and connected to your doctor is the best way to support you and your baby.