Sleep, Mood & Mind
Restless Legs Syndrome in Pregnancy
An uncomfortable urge to move your legs, common in late pregnancy and often linked to low iron — worth checking and easing with the right support.
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
- Most common in
- 3rd trimester
- Worth checking
- Iron levels (via blood test)
- When it's worst
- Evening and night, at rest
- Does it resolve?
- Usually improves soon after birth
Just as you're trying to settle down to sleep, an odd, uncomfortable, crawling or tingling sensation deep in your legs can make you want to move them constantly. This is restless legs syndrome (RLS), and it becomes noticeably more common in the third trimester of pregnancy.
It can be frustrating and disturb your sleep, but it's rarely a sign of anything serious — and there's a well-known, checkable link to low iron levels that's worth discussing with your doctor or midwife. This guide covers why it happens, what helps, and when to get it looked at.
What is restless legs syndrome?
Restless legs syndrome (RLS) is a strong, often irresistible urge to move your legs, usually accompanied by an uncomfortable sensation described as crawling, tingling, itching, pulling or aching deep in the legs. Symptoms are typically worse when you're resting, especially in the evening or at night, and are relieved — at least temporarily — by moving or stretching your legs.
RLS is significantly more common in pregnancy than outside it, particularly in the third trimester, and tends to improve or disappear within weeks of giving birth. While the exact cause in pregnancy isn't fully understood, it's strongly associated with iron and folate levels, and hormonal changes are also thought to play a role.
It usually improves after birth
For most people, restless legs syndrome that develops in pregnancy fades away within a few weeks of the baby being born.
What causes restless legs syndrome in pregnancy?
RLS in pregnancy is linked to several overlapping factors, one of which is easily checked.
Low iron levels
Iron deficiency is one of the most consistent factors linked to RLS, and pregnancy increases your iron needs considerably. A simple blood test can check your levels.
Folate levels
Low folate has also been linked to restless legs symptoms in pregnancy.
Hormonal changes
Rising oestrogen and other hormonal shifts are thought to contribute to RLS specifically in pregnancy.
Changes in circulation
Pregnancy affects blood flow and volume, which may play a part in leg sensations, alongside conditions like varicose veins.
Family history
RLS often runs in families, so you're more likely to develop it in pregnancy if a close relative has it.
Poor sleep and fatigue
Tiredness can make RLS symptoms feel more pronounced, creating a frustrating cycle with disturbed sleep.
Worth asking about
- A blood test to check your iron (and ferritin) levels
- Whether your prenatal vitamin includes enough iron and folate
- Any family history of restless legs syndrome
When restless legs is a normal pregnancy symptom
Restless legs syndrome is a recognised, common pregnancy symptom rather than a sign of a serious problem. Reassuring signs include:
- Symptoms are worse in the evening or at rest and ease with movement or stretching.
- You don't have other worrying leg symptoms such as swelling, redness, warmth or pain in one leg.
- It disturbs your sleep or comfort but doesn't stop you functioning day to day.
- You're otherwise feeling well between episodes.
Different from a blood clot
RLS causes an urge to move, relieved by movement. A painful, swollen, hot or red patch in one leg — especially the calf — is different and needs urgent medical assessment, as it can be a sign of a blood clot (DVT).
Warning signs — get medical advice
Restless legs syndrome itself isn't dangerous, but contact your doctor or midwife if you notice:
Seek urgent medical care if you have
- One leg that's swollen, red, warm or painful, especially in the calf — this needs same-day assessment to rule out a blood clot.
- Restless legs symptoms are severe, happening daily, and seriously disrupting your sleep.
- Signs of significant tiredness, breathlessness or paleness alongside restless legs, which can suggest anaemia.
- Symptoms spreading to your arms or becoming constant, rather than mainly in the evening.
- You feel low or anxious because of ongoing sleep loss from restless legs.
Reduced or absent baby movements are never caused by restless legs — but if you ever notice this, contact your maternity unit the same day to be checked.
Get your iron checked
If you have restless legs syndrome, ask your doctor or midwife for an iron (ferritin) blood test — treating low iron often improves symptoms considerably.
Easing restless legs syndrome
These strategies help many people manage restless legs syndrome day to day, alongside getting your iron levels checked.
Movement and stretching
- Stretch your legs and calves before bed.
- Take a short walk or do gentle leg exercises in the evening.
- Move or wiggle your legs as soon as the sensation starts, rather than trying to ignore it.
Comfort measures
- Try a warm bath before bed, or alternate warm and cool compresses on your legs.
- Massage your legs, or ask a partner to help.
- Use compression stockings if you also have swelling or varicose veins.
Lifestyle adjustments
- Cut back on caffeine, particularly in the afternoon and evening.
- Keep a consistent sleep routine where possible.
- Avoid alcohol, which can worsen symptoms.
Nutrition
- Ask your doctor or midwife about checking and, if needed, treating low iron or folate.
- Eat iron-rich foods such as leafy greens, beans, and lean meat as part of a balanced diet.
- Don't start iron supplements beyond your prenatal vitamin without medical advice, as too much iron can also cause problems.
Small changes add up
No single remedy works for everyone with RLS — combining a few of these approaches, alongside checking your iron, gives you the best chance of relief.
When to consult a doctor
Speak to your doctor or midwife if:
- Restless legs symptoms are frequent, severe, or significantly disturbing your sleep.
- You haven't had your iron levels checked and think you might be low (pale, tired, breathless).
- Self-care measures aren't helping after a few weeks of trying.
- You notice swelling, redness, warmth or pain in one leg.
- Poor sleep from restless legs is affecting your mood or ability to cope.
Keep a record for your midwife
Note when restless legs symptoms happen and how they affect your sleep — this detail helps your midwife decide whether tests or treatment would help.
Open the Pregnancy TrackerFrequently asked questions
Why do I suddenly have restless legs in pregnancy?
RLS becomes much more common in the third trimester, largely linked to lower iron levels, hormonal changes and increased blood volume. It's a recognised, common pregnancy symptom.
Does restless legs syndrome mean I'm anaemic?
Not necessarily, but low iron is one of the strongest known links to RLS, so it's well worth asking your doctor or midwife for an iron (ferritin) blood test.
Will restless legs syndrome go away after I give birth?
For most people, yes — RLS that starts in pregnancy typically improves within days to weeks after the baby is born.
What can I take for restless legs in pregnancy?
Don't take any restless legs medicines or supplements, including extra iron beyond your prenatal vitamin, without checking with your doctor first. Many cases improve with stretching, warmth, cutting caffeine, and treating any iron deficiency found on testing.
How is restless legs syndrome different from leg cramps?
Leg cramps are sudden, painful muscle tightening, often in the calf, usually at night. Restless legs syndrome is an urge to move your legs with an uncomfortable crawling or tingling sensation, relieved by movement — they can occur together but are different symptoms.
When should restless legs in pregnancy be checked urgently?
Seek same-day medical attention if one leg becomes swollen, red, warm or painful, as this needs to be checked separately to rule out a blood clot — this is different from typical restless legs syndrome.
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 — Restless legs syndrome
- NHS — Iron deficiency anaemia
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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