Circulation & Breathing
Swelling (Oedema) in Pregnancy
Gradual swelling in the legs, ankles and feet is common in the third trimester — but sudden or severe swelling of the face and hands needs urgent checking for pre-eclampsia.
Written and fact-checked by the ParentVibes editorial team against WHO, NHS, ACOG and peer-reviewed guidance. Not yet reviewed by a named clinician.
Quick facts
- When it's common
- Third trimester, worse by end of day
- Usual areas
- Ankles, feet, hands and fingers
- Usual cause
- Extra fluid and pressure on leg veins
- Urgent if
- Sudden swelling of face, hands or around the eyes
- Also urgent
- One leg swollen, painful, red or warm (possible clot)
By the third trimester, many people notice their ankles, feet and fingers puff up, especially by the end of the day or in warm weather. This kind of gradual swelling — medically called oedema — is one of the most recognisable signs of late pregnancy and, for most people, it's simply uncomfortable rather than dangerous.
However, swelling is also one of the few pregnancy symptoms where a sudden change really matters. This guide explains what's driving normal pregnancy swelling, how to ease it, and the specific pattern of sudden or severe swelling — particularly of your face and hands — that can be an early sign of pre-eclampsia and needs prompt medical attention.
What is swelling (oedema) in pregnancy?
Oedema is the medical term for the build-up of fluid in your body's tissues, causing visible puffiness — most often in the ankles, feet, lower legs and, later on, the hands and fingers. It's extremely common in the third trimester, as your body holds onto more fluid than usual and your growing uterus presses on the veins that carry blood back from your legs, encouraging fluid to pool in your lower body.
Typical pregnancy swelling builds gradually across the day, is often worse in hot weather or after standing for long periods, and eases overnight or when you rest with your legs raised. It usually affects both legs and feet fairly evenly. This kind of swelling isn't harmful, though it can be uncomfortable and make shoes and rings feel tight.
A pattern worth learning
Get familiar with your own 'normal' swelling — its usual extent and how it responds to rest — so you can quickly notice if something changes.
What causes swelling in pregnancy?
Pregnancy swelling has several normal, well-understood causes:
Extra fluid in your body
Pregnancy naturally increases the amount of fluid and blood your body holds, and some of this settles in your tissues, particularly your lower legs.
Pressure from your growing uterus
As your uterus grows, it presses on the large veins carrying blood back from your legs, making it harder for fluid to return to your heart and easier for it to pool in your feet and ankles.
Hormonal changes
Pregnancy hormones relax the walls of your veins, which can also contribute to fluid pooling in your legs.
Heat and long periods of standing or sitting
Warm weather, standing for long stretches, or sitting with your feet down for a long time can all make swelling worse.
Diet and hydration
Counterintuitively, not drinking enough fluid can make your body retain more, and a diet very high in salt can also contribute.
Carrying twins or more
Multiple pregnancies place extra demand on your circulation and are often linked with more noticeable swelling.
More likely if…
- It's hot weather
- You're on your feet a lot, or sit still for long periods
- You're further along in the third trimester
- You're carrying twins or more
When swelling is normal
Gradual, symmetrical swelling in the third trimester is common and usually harmless. These patterns are reassuring:
- Swelling builds up gradually across the day and is worse by evening.
- Both legs, ankles or feet are swollen to a similar degree.
- Swelling eases noticeably overnight, or after resting with your legs raised.
- You feel well otherwise, with no headache, vision changes or tummy pain.
| Usually normal swelling | Needs urgent attention | |
|---|---|---|
| Onset | Gradual, over hours or days | Sudden, appearing within hours |
| Location | Both legs, ankles, feet evenly | Face, hands, around the eyes; or just one leg |
| Response to rest | Eases with elevation and overnight | Doesn't ease, or keeps getting worse |
| Other symptoms | None | Headache, vision changes, pain under ribs, or one leg red/hot/painful |
Rings and shoes
If rings or shoes suddenly feel much tighter than usual, or swelling appears earlier in the day than it normally does, mention it to your midwife — it's a useful early clue if something is changing.
Warning signs — get medical help now
Sudden or unusual swelling can be an early sign of pre-eclampsia or a blood clot, both of which need prompt care. Contact your doctor or midwife urgently, or go to your nearest emergency department, if you have:
Seek urgent medical care if you have
- Sudden or severe swelling of your face, hands or around your eyes.
- Swelling with a bad headache that doesn't ease with rest or your usual pain relief.
- Swelling with vision changes — blurring, flashing lights or spots.
- Swelling with pain just below your ribs, particularly on the right.
- Swelling in just one leg, especially if it's painful, red, warm to the touch or looks different from the other leg (possible blood clot).
- Swelling that comes on very suddenly or gets rapidly worse.
If you ever notice your baby's movements have reduced or stopped, contact your maternity unit the same day, whatever else is going on.
Face and hand swelling needs checking now
Sudden swelling of the face, hands or around the eyes — especially with a headache, vision changes or pain under your ribs — can be an early sign of pre-eclampsia. You'll need your blood pressure and urine checked promptly, so contact your maternity unit straight away rather than waiting.
Self-care & easing swelling
Normal pregnancy swelling can often be eased with simple measures:
Elevate and rest
- Put your feet up on a stool or pillows whenever you sit.
- Lie down with your legs raised above your heart level for short periods.
- Avoid standing or sitting still for long stretches — move regularly.
Support your circulation
- Take gentle, regular walks to keep blood flowing.
- Try wiggling your ankles and feet if you've been sitting for a while.
- Ask your midwife about support (compression) stockings.
Stay cool and hydrated
- Drink plenty of water — this actually helps reduce fluid retention.
- Avoid very hot weather where possible; stay in the shade or somewhere cool.
- Wear loose, comfortable clothing and shoes that allow for some swelling.
Left-side rest
Lying on your left side, rather than your back, can improve blood flow back to your heart and may reduce swelling.
When to consult a doctor
Book a prompt appointment with your doctor or midwife (rather than waiting) if:
- Swelling appears earlier or more severely than in a previous pregnancy.
- Swelling isn't easing overnight or with rest and elevation.
- You notice swelling spreading to new areas, like your face or hands.
- You're unsure whether your swelling is 'normal' for your stage of pregnancy.
- Swelling is affecting your ability to walk or wear your usual shoes comfortably.
Track your swelling day by day
Noting where and when swelling happens helps your midwife tell normal pregnancy swelling from something that needs a closer look.
Open the Pregnancy TrackerFrequently asked questions
Is swelling normal in the third trimester?
Yes. Mild to moderate swelling in the legs, ankles and feet is common in the third trimester, usually worse by the end of the day, and settles overnight.
What is pre-eclampsia and how does swelling relate to it?
Pre-eclampsia is a blood pressure condition that can develop in pregnancy. Sudden swelling of the face or hands can be one sign, alongside high blood pressure and protein in the urine, so it needs a blood pressure and urine check.
How can I tell normal swelling from pre-eclampsia swelling?
Normal swelling builds gradually, affects both legs evenly and eases with rest. Swelling linked to pre-eclampsia tends to appear suddenly, can affect the face and hands, doesn't ease, and often comes with a headache or vision changes.
Why is only one of my legs swollen?
Swelling limited to one leg — especially if it's painful, red or warm — needs urgent checking, as it can be a sign of a blood clot (deep vein thrombosis).
Does drinking more water help or worsen swelling?
It helps. Staying well hydrated actually reduces fluid retention, while not drinking enough can make swelling worse.
Will swelling go away after birth?
Yes, for most people it resolves within days to a couple of weeks after birth, as your body naturally loses the extra fluid it held during pregnancy.
Your next steps
Track your pregnancy
Log symptoms week by week, get personalised tips, and see how your pregnancy is progressing.
Open Pregnancy TrackerPregnancy week-by-week
Follow your baby's growth and your body's changes from week 1 to 40 in plain language.
Explore the guideFind a gynaecologist
Have a personal concern? Book with a trusted obstetrician or gynaecologist near you.
Find a doctorRelated pregnancy symptoms
Helpful resources
Sources
- NHS — Pregnancy: common symptoms & concerns
- ACOG — Pregnancy resources (American College of Obstetricians and Gynecologists)
- WHO — Maternal health & pregnancy care
- NHS — Swollen ankles, feet and fingers in pregnancy
- ACOG — Preeclampsia and High Blood Pressure During Pregnancy
Next review due: 6 January 2027.
Medical disclaimer
This page is general information about a common pregnancy symptom and does not replace personal medical advice. Every pregnancy is different. If you have severe pain, heavy bleeding, a bad headache with vision changes, reduced or absent baby movements, breathing difficulty, fever, or you feel something is seriously wrong, contact your doctor or midwife or go to your nearest emergency department straight away. When in doubt, always get checked — it is never a waste of anyone's time.
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