Why your legs swell during pregnancy and what to help
Nicola Tik
Swelling in the legs, ankles and feet is one of the most common experiences during pregnancy. It can feel uncomfortable and sometimes a little alarming, but for most people it is a normal part of how the body responds to the demands of pregnancy.
During pregnancy, your body produces significantly more blood and fluid than usual to support your growing baby. Some of this extra fluid naturally moves into the surrounding tissues, particularly in the lower legs and feet, where it tends to pool due to gravity.
As your bump grows, the uterus also places gentle pressure on the veins that return blood from your legs to your heart. This slows circulation slightly, making it easier for fluid to accumulate in the lower limbs. Swelling tends to be most noticeable towards the end of the day, after periods of standing or sitting, and during warmer weather.
Standing or sitting in one position for long periods, warm temperatures, and tiring days all contribute to swelling feeling more pronounced. Warmth causes blood vessels to expand and fluid to shift into the tissues more readily, which is why many people notice swelling more in summer or after a long day on their feet. Knowing what aggravates it is useful, because many of these are things you can do something about.
Movement is one of the most effective ways to encourage fluid to circulate rather than pool. Short, regular walks and gentle movement through the ankles and feet help activate the muscle pump in your calves, which plays a big role in returning fluid upward through the legs. Gentle ankle circles and slow foot pumps, moving your feet up and down, are easy to build into your day whether you are sitting at a desk or resting at home.
When you do rest, elevating your feet above the level of your hips helps fluid drain away from the lower legs. Avoiding long stretches in one position and choosing comfortable, supportive footwear that accommodates any swelling rather than restricting it can also make a noticeable difference across the day.
Staying well hydrated helps too. It might feel counterintuitive, but drinking enough water supports your body in managing fluid balance more effectively.
Swelling often increases as pregnancy progresses, particularly in the third trimester when fluid volume is at its highest and the pressure on circulation from your bump is greatest. Most swelling eases overnight when you are lying down and your body has a chance to redistribute fluid more evenly. Some days will feel more comfortable than others, and that variation is normal.
If you notice swelling that comes on suddenly, affects only one leg, or is accompanied by pain, redness or warmth in the leg, it is worth speaking to your GP or midwife.