Low Blood Pressure During Pregnancy – What’s Normal and When to Worry
Low blood pressure during pregnancy—especially in the first and second trimesters—is very common. For most moms-to-be, it’s not dangerous, but it can bring on symptoms like dizziness or fatigue. If your blood pressure stays below 90/60 mmHg but you're feeling well otherwise, it’s typically considered a normal change of pregnancy.
⚖️ Most of the time, low blood pressure isn’t risky by itself. Still, it’s important to notice any unusual or severe symptoms.
What Is Low Blood Pressure and Why Is It Common in Pregnancy?
Medically called hypotension, low blood pressure means your systolic reading (the top number) is under 90 mmHg. During pregnancy, your body’s circulation adapts in several ways:
- Your uterus has an increased need for blood flow.
- Hormonal shifts—especially higher progesterone—relax and widen your blood vessels.
- Your total blood volume rises significantly, which can lower your blood pressure.
This drop is often most pronounced between weeks 13 and 24, and tends to rise again by your third trimester.
What Symptoms Can Low Blood Pressure Cause?
Some women notice:
- Dizziness, especially after standing up quickly 🌀
- Sudden weakness or feeling faint
- Temporary blurred vision or headaches
- Cold, clammy skin
- Faster heart rate
- Tendency to faint
Other possible effects include increased fatigue and trouble concentrating.
Real-Life Scenarios: How Low Blood Pressure Shows Up
- Feeling lightheaded upon getting out of bed: Try sitting at the edge of the bed for a few moments before standing up slowly.
- Waiting in line makes you dizzy or weak: Listen to your body—if you feel unusually tired, sit down, drink some water, or have a salty snack.
- Symptoms worsen in heat: Hot, humid days can dilate blood vessels further, so take care to stay hydrated and rest when temperatures climb.
Why Does Blood Pressure Drop in Pregnancy? — An Easy-to-Understand Explanation
As your baby grows, both your uterus and the placenta require more blood. Blood vessels expand to meet this demand, spreading your blood over a larger network and causing pressure to fall. Progesterone further relaxes vessel walls, accentuating the effect. This process is natural—it helps nourish your baby, even though it might leave you feeling less energetic.
Are There Any Risks Linked to Low Blood Pressure?
Mildly low blood pressure on its own:
- Does not harm your baby
- Only rarely causes real risks
However, be cautious if:
- You actually faint: Sudden falls from fainting can cause injuries.
- Your pressure is extremely low for a long time: Prolonged low readings may affect your (and your baby’s) oxygen supply.
- Unusually severe symptoms appear: (such as loss of consciousness, sudden severe weakness, or chest pain) — get checked by your doctor immediately.
When Should You Contact Your Doctor?
Reach out to your healthcare provider if:
- Your blood pressure is consistently below 90/60 mmHg, especially if you often feel dizzy or have fainted
- You experience vomiting, diarrhea, or sudden weight loss (signs of possible dehydration)
- You notice vision changes, chest pain, or severe headaches
Don’t stress about every mild symptom. But if you’re struggling with daily tasks, or have a history of circulatory problems, it’s worth getting checked.
Tips for Managing Blood Pressure in Pregnancy
- Drink plenty of water (aim for 2–2.5 liters per day)
- Eat small, frequent meals and don’t skip eating
- Stand up slowly instead of quickly
- Wear loose clothing and avoid overheating
- Gentle exercise and regular walking can improve circulation
Always pay attention to how your body feels, and ask for support when you need it.
It’s perfectly normal to feel concerned by all the changes in your body during pregnancy. Low blood pressure is usually just one of those changes and—while it may be annoying—it seldom means something is wrong. If you’re ever unsure or symptoms are troubling, don’t hesitate to reach out to your doctor. And if you want extra support and practical tips, our app can help you track your body’s changes and your baby’s growth through every stage.