Circulation & Breathing
Swollen Feet & Ankles in Pregnancy
Puffy feet and ankles are extremely common in the third trimester and usually ease with rest — but sudden, severe or one-sided swelling needs checking.
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 evening
- How common
- Affects most people to some degree
- Best relief
- Elevation, movement and supportive shoes
- One swollen leg?
- Get checked promptly — possible blood clot
- Sudden face/hand swelling?
- Seek urgent care — possible pre-eclampsia
If your favourite shoes suddenly feel a size too small by the end of the day, you're not imagining it — swollen feet and ankles are one of the classic, almost universal signs of late pregnancy. For most people it's an uncomfortable but harmless nuisance rather than a medical concern.
Still, it's worth knowing what 'normal' foot and ankle swelling looks like so you can spot the less common patterns — swelling in just one leg, or sudden swelling spreading to your face and hands — that need prompt medical attention. This guide covers both.
What causes swollen feet and ankles in pregnancy?
Swelling in your feet and ankles happens because pregnancy increases the amount of fluid in your body, and your growing uterus presses on the veins that carry blood back up from your legs. This combination makes it easier for fluid to pool in the lowest parts of your body — your feet and ankles — especially as gravity pulls it downward through the day.
It's extremely common from the third trimester, tends to be worse in hot weather, after long periods of standing or sitting, and towards the end of the day. It usually affects both feet and ankles fairly evenly and settles down noticeably overnight or after resting with your feet raised.
Shoes may need to change
Many people find they need a slightly larger or more adjustable shoe in the last trimester. This is completely normal and worth planning for rather than fighting.
What makes foot and ankle swelling worse?
Beyond the general fluid changes of pregnancy, a few specific things tend to make foot and ankle swelling more noticeable:
Standing or walking for long periods
Gravity pulls fluid down into your feet and ankles, so jobs or activities involving a lot of standing tend to worsen swelling by the end of the day.
Hot weather
Heat causes your blood vessels to widen, which can allow more fluid to move into your tissues, making swelling worse in summer or warm climates.
Sitting with your feet down for long stretches
Long car journeys, flights or desk work without moving your legs can allow fluid to pool in your lower legs.
Tight or unsupportive footwear
Shoes that constrict your feet can worsen discomfort, though they don't cause the underlying swelling.
Low activity levels
Gentle movement helps pump fluid back up your legs via your calf muscles, so long periods of inactivity can make swelling worse.
High salt intake or dehydration
A very salty diet or not drinking enough water can both contribute to fluid retention.
Worse towards the end of the day?
That's typical. Gravity accumulates fluid in your feet through the day; it should visibly reduce after a night lying down, when fluid redistributes more evenly.
When swollen feet and ankles are normal
For most people in the third trimester, some foot and ankle swelling is entirely expected. These patterns are reassuring:
- Swelling is roughly equal in both feet and ankles.
- It builds gradually across the day and is at its worst by evening.
- It noticeably reduces after a night's sleep or a period of resting with your feet up.
- You have no pain, redness or warmth in the swollen area, and feel well otherwise.
| Usually normal swelling | Needs prompt medical attention | |
|---|---|---|
| Which side | Both feet and ankles evenly | Only one leg, or one much more than the other |
| Skin | Normal colour and temperature | Red, hot, or noticeably discoloured |
| Pain | Mild achiness or tightness | Marked pain or tenderness, especially in the calf |
| Pattern | Builds through the day, eases overnight | Sudden onset, or spreading to face and hands |
Compression socks
Maternity support or compression socks, put on first thing in the morning before swelling builds up, can noticeably reduce discomfort for many people. Ask your midwife or pharmacist for advice on the right type.
Warning signs — get medical help now
Occasionally, foot or ankle swelling signals something needing urgent attention — most importantly a blood clot (DVT) or pre-eclampsia. Contact your doctor or midwife urgently, or go to your nearest emergency department, if you have:
Seek urgent medical care if you have
- Swelling in only one leg, especially if it's painful, red, warm to the touch, or looks different from the other leg.
- Calf pain that's worse when you flex your foot upward, alongside swelling.
- Sudden or rapidly worsening swelling in your feet, ankles or legs.
- Swelling spreading upward to your face or hands, particularly with a headache, vision changes or pain under your ribs.
- Swelling with breathlessness or chest pain (a clot can occasionally travel to the lungs).
If you ever notice your baby's movements have reduced or stopped, contact your maternity unit the same day, whatever else is going on.
One swollen leg needs urgent checking
Pregnancy increases the risk of blood clots (DVT). Swelling in just one leg — especially with pain, redness or warmth — needs prompt assessment, so don't wait for it to settle on its own.
Self-care & practical relief
Most everyday foot and ankle swelling responds well to simple, practical measures:
Elevate and rest your feet
- Prop your feet up on a stool, cushion or low table whenever you're sitting.
- Lie down with your legs raised on pillows for 15–20 minutes a few times a day.
- Avoid crossing your legs, which can restrict circulation further.
Keep moving
- Take regular short walks to help your calf muscles pump fluid back up your legs.
- Do gentle ankle circles and foot flexes if you're sitting for a long time.
- Avoid standing completely still for long periods — shift your weight or walk on the spot.
Choose supportive footwear
- Wear wide, comfortable, low-heeled shoes with room to accommodate swelling.
- Avoid tight socks or shoes that leave marks on your skin.
- Consider maternity compression socks, put on before swelling builds up in the morning.
Manage fluid and diet
- Drink plenty of water throughout the day — this helps rather than worsens swelling.
- Cut back on very salty foods where you can.
- Cool your feet with a cold compress or a foot soak if they feel hot and puffy.
Swim or float
If you have access to a pool, gentle swimming or simply standing in water can relieve swelling, as water pressure helps move fluid back into circulation.
When to consult a doctor
Book a prompt appointment with your doctor or midwife if:
- Swelling is significantly worse than before, or worse than in a previous pregnancy.
- Home measures like elevation and rest aren't helping at all.
- Swelling is making it hard to walk or fit into any of your shoes.
- You notice swelling starting to affect your hands or face as well as your feet.
- You're unsure whether your swelling is within the range of 'normal' for your stage of pregnancy.
Keep an eye on changes
Logging your swelling alongside other symptoms helps your midwife spot patterns and reassure you — or investigate further if needed.
Open the Pregnancy TrackerFrequently asked questions
Why do my feet swell so much in the third trimester?
Extra fluid in your body, combined with your growing uterus pressing on the veins that return blood from your legs, causes fluid to pool in your feet and ankles.
Do compression socks actually help?
Many people find maternity compression or support socks noticeably reduce swelling and discomfort, especially when put on first thing in the morning. Ask your midwife or pharmacist for the right type.
Is it normal for swelling to be worse at the end of the day?
Yes, this is typical, as gravity causes fluid to accumulate in your feet through the day. It should improve noticeably after a night lying down.
Why is only one of my feet swollen?
Occasional variation can be normal, but swelling in only one leg — especially with pain, redness or warmth — needs an urgent check to rule out a blood clot.
Can I prevent swollen feet in pregnancy?
You can't fully prevent it, but elevation, regular movement, staying hydrated and wearing supportive shoes can all reduce how much your feet swell.
When should I worry about swollen feet in pregnancy?
Seek prompt medical advice for sudden or severe swelling, swelling in one leg only with pain, redness or warmth, or swelling that spreads to your face or hands alongside a headache or vision changes.
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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