Swelling during Pregnancy

Mild swelling (edema) during pregnancy is extremely common, especially in the feet, ankles, legs, and sometimes hands. It usually develops gradually, worsens later in the day or in hot weather, and is caused by increased blood volume, fluid retention, and pressure from the growing uterus on veins.

Most of the time it is harmless. Sudden, severe, or one-sided swelling or swelling paired with other symptoms can signal serious conditions such as preeclampsia or a blood clot and needs prompt medical attention.

Is Swelling During Pregnancy Normal?

Yes. Up to 80% of pregnant women experience some lower-leg swelling, particularly in the second and third trimesters. Your body retains extra fluid to support the baby, soften tissues, and prepare for birth.

Hormonal changes and the weight of the uterus slowing blood return from the legs contribute to fluid buildup in the lowest parts of the body.

Typical (normal) pregnancy swelling usually:

• Builds gradually.
• Affects both feet/ankles (and sometimes hands) more in the evening or after standing.
• Improves somewhat with rest and elevation.
• Does not come with severe headache, vision changes, or upper abdominal pain.

When to Worry About Swelling in Pregnancy (Red Flags)

Contact your midwife, doctor, or maternity unit immediately (or go to emergency care if severe) if you notice any of the following:

• Sudden or rapid increase in swelling, especially in the face, around the eyes, or hands (rings suddenly not fitting).
• Swelling that is much worse in one leg than the other
• Swelling in one leg accompanied by pain, tenderness, warmth, redness, or discoloration (possible deep vein thrombosis/DVT).
• Severe or persistent headache that does not go away.
• Vision changes (blurring, flashing lights, spots, or light sensitivity).
• Pain just below the ribs or in the upper abdomen (especially right side).
• Shortness of breath, chest pain, or feeling very unwell.
• Sudden significant weight gain, nausea/vomiting later in pregnancy, or heartburn that does not respond to antacids.

These can be signs of preeclampsia (high blood pressure with organ involvement, affecting roughly 2-8% of pregnancies, usually after 20 weeks) or a blood clot. Preeclampsia requires monitoring and treatment to protect both you and the baby; early detection improves outcomes. One-sided painful swelling needs urgent evaluation for DVT.

Always trust your instincts, if something feels different or concerning, get checked. Regular prenatal care helps catch issues early.

What Causes Swelling in Pregnancy?

• Increased blood volume and fluid retention.
• Pressure of the growing uterus on pelvic veins and the vena cava.
• Hormonal changes that promote fluid retention.
• Contributing factors: heat, prolonged standing, long periods of activity, high sodium intake, low potassium, or excess caffeine.

Mild face or hand puffiness can occur normally, but sudden or marked facial/hand swelling is more concerning.

How to Reduce Swelling During Pregnancy

These practical steps often help with normal edema (they do not replace medical advice):

1. Elevate your feet and legs whenever possible (ideally above heart level).

2. Rest on your left side to improve circulation.

3. Stay active with gentle walking or pregnancy-safe movement; avoid long periods of standing or sitting.

4. Wear comfortable, supportive shoes (skip high heels) and loose clothing that does not constrict ankles or wrists.

5. Consider graduated compression stockings if recommended by your provider.

6. Stay well hydrated (water is best; aim for adequate daily intake as advised by your care team).

7. Eat potassium-rich foods (e.g., bananas) and moderate sodium rather than extreme restriction.

8. Limit caffeine.

9. Use cool compresses on swollen areas and stay out of extreme heat.

10. Take short movement breaks and gently flex/circle your ankles when seated.

Swelling typically improves significantly within days after birth as excess fluid is lost.

Key Takeaways for Swelling in Pregnancy

Preeclampsia

Preeclampsia is a serious condition that can cause high blood pressure and damage to your organs, including your kidneys and liver. It's essential to get regular prenatal care and to report any sudden changes in your body to your healthcare provider.

They'll be able to monitor your blood pressure and check for any signs of preeclampsia.

How do You Know?

So, how do you know when swelling is just a normal part of pregnancy and when it's a sign of something more serious?

If you're experiencing severe headaches, vision changes, or belly pain in addition to swelling, it's essential to seek medical attention right away.

Diagnosed with Preeclampsia

If you're diagnosed with preeclampsia, your healthcare provider will work with you to develop a treatment plan that's right for you. This may involve more frequent prenatal appointments, bed rest, or even hospitalization in severe cases. 

Pregnancy swelling is a common complaint among expectant moms, but it's essential to know when to worry and when to just roll with it.

By recognizing the signs of normal swelling and the warning signs of preeclampsia, you can take control of your health and ensure a healthy pregnancy.

Common Q&A for Swelling when Pregnant

1. Is swelling during pregnancy normal?

Yes, mild to moderate swelling (edema) is very common and usually normal, especially in the feet, ankles, and legs during the second and third trimesters.

It happens because your body retains extra fluid and blood volume to support the baby, and the growing uterus puts pressure on the veins in your legs. Up to 80% of pregnant women experience some lower-leg swelling.

Gradual swelling that worsens later in the day or in hot weather is typically nothing to worry about.

2. When should I worry about swelling during pregnancy?

Contact your doctor, midwife, or maternity unit immediately if you have:

• Sudden or rapid swelling (especially in the face, around the eyes, or hands).
• Swelling much worse in one leg than the other.
• Swelling with pain, redness, warmth, or tenderness in one leg (possible blood clot)
• Severe headache, vision changes (blurring, spots, flashing lights), upper abdominal pain, shortness of breath, or sudden significant weight gain.

These can be signs of preeclampsia or deep vein thrombosis (DVT) and need urgent assessment.

3. How can I reduce swelling during pregnancy?

Try these evidence-backed tips:

• Elevate your feet and legs whenever possible.
• Rest on your left side.
• Stay active with gentle walking and avoid long periods of standing or sitting.
• Wear comfortable shoes and consider compression stockings.
• Stay well hydrated and limit excess salt/caffeine.
• Avoid extreme heat.

Mild swelling often improves with these lifestyle changes.

4. What causes swelling in pregnancy?

The main causes are:

• Increased blood volume and fluid retention (needed to support the baby).
• Hormonal changes that encourage fluid retention.
• Pressure from the growing uterus on the pelvic veins and vena cava, which slows blood. return from the legs.
• Heat, prolonged standing, high sodium intake, and low potassium can make it worse.

5. When does pregnancy swelling go away?

Most women notice a big improvement within 24–48 hours after delivery as the body starts shedding the extra fluid. Full resolution usually happens within a few days to a couple of weeks postpartum. Some temporary increase in swelling can occur right after birth, which is normal.

Resources

NHS – Swollen ankles, feet and fingers in pregnancy
Clear, concise, and trusted UK national health guidance. Excellent on red-flag symptoms and when to seek urgent care.

Mayo Clinic – Ankle swelling during pregnancy: What helps?
Practical advice on causes, relief methods, and warning signs from one of the world’s leading medical institutions.

Merck Manual (Consumer Version) – Swelling During Late Pregnancy
Detailed medical explanation of normal vs. concerning swelling, including evaluation of serious causes like preeclampsia and DVT.

Article review: Article updated and reviewed by Kerryn Boyle on 17/09/2026.