Swollen feet and ankles in pregnancy: what is normal and what is not

Pregnancy · Updated July 2026 · All articles

Swollen feet and ankles are one of the most common physical complaints of pregnancy, particularly in the second half. For most people, the swelling is a straightforward and temporary consequence of pregnancy physiology, uncomfortable but harmless. Knowing what normal swelling looks like, which symptoms should prompt an urgent call to your midwife, and what actually helps reduce the discomfort means you can approach the experience calmly and act quickly if something needs attention.

Why swelling happens in pregnancy

Pregnancy oedema (fluid retention causing swelling) is driven by several interacting factors. First, blood volume increases by 40 to 50 percent during pregnancy to support the placenta and baby. This expanded volume puts greater pressure on blood vessel walls, causing more fluid to leak into surrounding tissues. Second, progesterone causes the walls of blood vessels to relax and become more permeable, which further increases fluid movement into tissues. Third, gravity: the body is most efficient at returning fluid from the lower extremities to the circulation when you are active, and when you sit or stand for long periods the fluid pools in the lower legs, ankles and feet.

The growing uterus also plays a role in the third trimester. As the uterus reaches its full size it places pressure on the inferior vena cava (the large vein that returns blood from the lower body to the heart), slowing venous return from the legs and making it easier for fluid to accumulate. This is one of the reasons swelling is typically worse in the final weeks of pregnancy and why it often reduces slightly when you lie on your side, which takes the uterine pressure off the vena cava.

What normal pregnancy swelling looks like

Normal pregnancy oedema has a recognisable pattern that helps distinguish it from swelling that needs assessment. It typically: appears gradually over the course of the day, being worst by early evening; affects both feet and ankles symmetrically; is more noticeable in warm weather or after a long day on your feet; improves significantly overnight after lying down; and does not cause severe pain, though it can make the skin feel tight and sore. Shoes that fit in the morning may not fit by afternoon, and many people go up one or even two shoe sizes during pregnancy.

Mild pitting oedema (where briefly pressing the skin leaves a shallow dent) is normal in pregnancy. Some swelling of the lower legs and calves is also common and does not necessarily indicate a blood clot, particularly if it is bilateral (both legs equally). That said, significant calf swelling with pain or redness in one leg should always be assessed to rule out deep vein thrombosis, which is more common in pregnancy.

Warning signs that need urgent attention

Certain patterns of swelling during pregnancy require an urgent call to your midwife or maternity triage, not a wait-and-see approach. These are the symptoms that can indicate pre-eclampsia, a serious pregnancy complication affecting the blood pressure, kidneys and other organs.

Contact your midwife or triage urgently if you experience: sudden severe swelling, particularly if it comes on quickly over a few hours rather than building gradually; swelling of the face or hands, not just the feet and ankles; swelling combined with a headache that does not respond to paracetamol; visual changes such as blurring, flashing lights, floaters or temporary vision loss; pain under your right ribs; or feeling unusually unwell, nauseous or confused alongside swelling.

Pre-eclampsia requires prompt assessment and monitoring. Its symptoms can progress quickly and it is one of the conditions where acting immediately rather than waiting until the next antenatal appointment matters.

One-sided swelling (only one leg or foot swelling significantly) with pain, warmth or redness in the calf is a separate concern: this is the classic presentation of deep vein thrombosis (DVT), which is more common in pregnancy because of changes to blood clotting. DVT also requires urgent assessment, not because it is immediately life-threatening in the calf but because of the risk that a clot can move to the lung (pulmonary embolism).

What actually helps for normal swelling

Elevation: raising your feet above the level of your heart is the most effective physical intervention for reducing swelling. Lying on a sofa with your feet propped up on cushions for 20 to 30 minutes in the afternoon makes a noticeable difference. Even resting with your feet elevated on a footstool while sitting is better than letting them hang down.

Compression socks: graduated compression socks improve venous return from the lower legs by providing gentle external pressure that supports the vein walls. They work best when you put them on first thing in the morning before the swelling builds, before you even get out of bed if possible. Class 1 graduated compression socks are appropriate for general pregnancy swelling. Talk to your midwife if you are considering Class 2 compression, which is used for higher-risk situations including history of DVT or varicose veins.

Staying active: walking uses the calf muscles as a pump to return blood and fluid upward from the legs. Regular short walks are more effective at reducing swelling than one long walk because the pumping action is continuous. Swimming is particularly helpful because the water pressure assists venous return and the horizontal position reduces gravitational pooling.

Cool water: soaking swollen feet and ankles in cool water provides immediate short-term relief by causing blood vessels to constrict slightly, reducing fluid leakage. Contrast bathing (alternating brief periods in cool and warm water) is used by some physiotherapists. Avoid very cold water on the bump.

Staying hydrated: a common instinct is to drink less to reduce swelling, but this is counterproductive. Dehydration causes the kidneys to retain more water and sodium, which worsens oedema. Drinking adequate water helps the kidneys function efficiently and allows the body to regulate fluid balance more effectively.

What does not help

Reducing your salt intake significantly is often recommended for pregnancy swelling, but the evidence that it makes a meaningful difference to oedema in otherwise healthy pregnant people is limited. Moderate salt intake as part of a balanced diet is appropriate. Excessive restriction without medical guidance is not advised.

Diuretics (water tablets) are not used to treat normal pregnancy oedema. They can reduce blood volume in ways that are harmful to placental perfusion and are only used in specific clinical situations under medical supervision.

Standing for long periods worsens swelling. If your job requires prolonged standing, compression socks and scheduled short walks or leg exercises (rising on the balls of your feet to activate the calf pump) can help. Discuss with your employer if the demands of your role are significantly worsening swelling, as reasonable adjustments are your legal right in pregnancy.

Footwear and clothing adjustments

Swollen feet need shoes with a wide fit, a low heel and good support. Tight shoes increase discomfort and can reduce circulation further. Many people find that trainers or wide-fit flat shoes are the only comfortable option in the third trimester. If your feet have genuinely expanded in size, buying a pair of supportive shoes half a size larger than usual is a worthwhile investment, as squeezing into your pre-pregnancy shoes worsens both the swelling and the discomfort.

Tight socks, socklets or anything that has a tight band around the ankle will worsen swelling by constricting venous return. Loose cotton socks or proper graduated compression socks are the best options.

When to contact your midwife

For normal swelling that follows the gradual, bilateral, worst-in-the-evening pattern, routine management as above is appropriate and no urgent contact is needed. However, if you are unsure whether your swelling is normal, or if it seems to be increasing rapidly, your midwife is the right person to ask. They will check your blood pressure, test your urine for protein, and assess whether further investigation is needed. Do not feel you are wasting anyone's time by mentioning swelling: it is a routine part of third trimester antenatal checks for good reason.

Frequently asked questions

Why do feet and ankles swell during pregnancy?

Swelling (oedema) in pregnancy is caused by a combination of increased blood volume, progesterone causing blood vessels to relax and leak fluid, and gravity pooling that fluid in the lower legs. It is normal and affects the majority of pregnant people, particularly in the third trimester.

When is swelling in pregnancy a concern?

Swelling becomes a concern when it is sudden and severe, affects the face or hands as well as the feet, is one-sided (which can suggest a blood clot), or comes with other symptoms such as headache, visual changes, pain under the ribs or protein in the urine. These can be signs of pre-eclampsia and need urgent assessment.

Do compression socks help with pregnancy swelling?

Yes. Graduated compression socks improve venous return and reduce fluid pooling in the lower legs. They work best when put on in the morning before you get up, before the swelling builds. Class 1 or Class 2 compression socks are appropriate for most pregnant people; your midwife can advise on the right grade.

Should I reduce my fluid intake to reduce swelling?

No. Reducing fluid intake does not reduce pregnancy oedema and can cause dehydration, which actually makes swelling worse. Staying well hydrated helps the kidneys flush excess sodium and fluid from the body more efficiently.

When does pregnancy swelling go away?

Normal pregnancy swelling usually resolves within a few days to a couple of weeks after birth as the body expels excess fluid. You may notice increased urination and sweating in the first week postpartum as the body clears the extra fluid accumulated during pregnancy.

Can I still exercise with swollen feet in pregnancy?

Yes, gentle exercise is one of the most effective ways to reduce swelling. Walking and swimming are both excellent options because they use the calf muscles to pump blood back up from the legs, reducing pooling. Avoid standing still for long periods, which worsens swelling.

This article is for general information only. Always consult your midwife, obstetrician, or GP for advice specific to your pregnancy.