You finally lie down after a long day. The house goes quiet, and then it starts: a creeping, fizzing, impossible-to-ignore feeling deep inside your calves. You shift your legs, and it eases. You lie still, and it comes back. Soon you are up and pacing the room at midnight because walking is the only thing that quiets it.
If this is happening to you, you are not imagining it, and you are far from alone. This feeling has a name, restless legs syndrome (RLS), and pregnancy is one of the most common times for it to appear.
I’m Dr. Suganya Venkat, an OB-GYN, and in my video consultations with pregnant women this is one of the symptoms that is most often mentioned almost as an apology, as if it were too small to bother a doctor with. It is not too small. It can take away a great deal of sleep, and there are sensible, safe things to try.
Here is what this post covers:
- What restless legs feel like, and how they differ from a cramp
- How common they are, and when in pregnancy they tend to appear
- Why they happen, including the link with low iron
- What you can safely do tonight, and what your doctor may check
- When to mention it, and what happens after the baby arrives
What Restless Legs Feel Like
Women describe it in many ways: crawling, tingling, pulling, itching under the skin, a restless ache, or simply “I have to move them.” The words vary, but the pattern is remarkably consistent.
The International Restless Legs Syndrome Study Group (IRLSSG) sets out the diagnostic criteria in its updated 2014 consensus (Allen RP et al., Sleep Med, 2014, PMID 25023924). In plain terms, restless legs means:
- An urge to move the legs, usually with an uncomfortable feeling in them.
- It starts or gets worse when you are resting, sitting or lying down.
- Moving relieves it, at least partly and for as long as you keep moving, such as walking or stretching.
- It is worse in the evening or at night than during the day.
- It is not better explained by something else, such as a cramp, a positional discomfort, or swelling. The 2014 update added this fifth criterion specifically so that look-alike symptoms are not mislabelled.
That fifth point matters in pregnancy, because pregnancy brings plenty of other leg discomforts. Doctors diagnose restless legs from your description, not from a scan or a single blood test, so the way you describe it helps a lot.
Restless legs or a leg cramp?
The two are often confused because both strike at night. The difference is usually clear once you know what to look for:
| Restless legs | Leg cramp | |
|---|---|---|
| Main feeling | An urge to move, with crawling or tingling | A sudden, hard, painful knot in the muscle |
| What helps | Moving or walking about | Stretching the muscle, flexing the foot up |
| Duration | Comes and goes through the evening while you rest | Usually over in seconds to a few minutes |
| Afterwards | Settles when you move | The calf may feel sore the next day |
If what you have sounds more like a sudden painful knot, our post on leg cramps during pregnancy covers that in detail, along with how to tell either of them apart from a clot.
How Common Is It, and When Does It Start?
Restless legs are common in pregnancy. A meta-analysis that pooled 27 studies covering 51,717 pregnant women found an overall prevalence of 21%, roughly one woman in five. The rate rose through pregnancy, from 8% in the first trimester to 16% in the second and 22% in the third. After delivery, it fell to 4% (Chen SJ et al., Sleep Med Rev, 2018, PMID 29169861).
The IRLSSG’s guideline on restless legs in pregnancy and breastfeeding gives the same picture, about one in five pregnant women in Western countries, and notes that many report moderate or severe symptoms that affect their sleep (Picchietti DL et al., Sleep Med Rev, 2015, PMID 25553600). The meta-analysis could not estimate a figure for South-East Asia, including India, because there were not enough studies from the region, so we do not yet have a good Indian number.
So if this started for you in the second half of pregnancy, that fits the usual pattern.
Why Does It Happen in Pregnancy?
The full explanation is not known. What research does show is a set of factors that make restless legs more likely. A 2026 review of restless legs management in pregnancy names three consistent risk factors (Jung KY, Sleep Med Clin, 2026, PMID 42161455):
- Iron deficiency
- A family history of restless legs
- Having had previous pregnancies
The iron link
Of these three, iron is the one you can do something about, which is why it gets so much attention. Your iron needs rise considerably in pregnancy as your blood volume expands and your baby grows, and many women in India start pregnancy with low iron stores to begin with. You can have low iron stores (a low ferritin) even when your haemoglobin is still in the normal range.
The IRLSSG guideline sets out a rationale for iron supplementation in pregnant women with restless legs (Picchietti DL et al., Sleep Med Rev, 2015, PMID 25553600), and the 2026 review calls oral or intravenous iron the safest and most effective therapy for restless legs in pregnancy (Jung KY, Sleep Med Clin, 2026, PMID 42161455).
There is also a small amount of direct evidence. In a Swiss study, 19 women in the third trimester with moderate to severe restless legs and low iron (ferritin below 35 µg/l or haemoglobin below 11.0 g/dl) were given a single iron infusion. One week later, their average score on the standard restless legs rating scale had fallen from 23 to 13, and their sleep quality improved (Schneider J et al., Sleep Med, 2015, PMID 26498233). This was an open-label pilot study with no comparison group, so it is encouraging rather than conclusive, and the authors themselves called for a placebo-controlled trial.
This is why, when a pregnant woman tells me about restless legs, my first question is about her iron. Please do not start or change iron tablets on your own, though. The right dose and form depend on your blood results, and that is a conversation for your doctor. Our guide to iron deficiency anaemia explains which blood tests show your iron stores, and our post on iron tablets in pregnancy covers how to take them with fewer stomach side effects.
Is it harmful to the baby?
Restless legs are a problem of your comfort and your sleep. The bigger cost is usually the broken nights, and poor sleep in pregnancy is worth addressing in its own right. That is a good reason to mention it, not a reason to worry.
💜 Restless legs keeping you up at night? Message Dr. Suganya on WhatsApp to book a ₹399 video consultation. Share how many weeks pregnant you are, when the feeling comes on, and any recent blood reports, and we will look at what is likely driving it.
What Can You Safely Do?
The IRLSSG guideline puts non-drug approaches first: reassurance, exercise, and avoiding the things that make symptoms worse (Picchietti DL et al., Sleep Med Rev, 2015, PMID 25553600). The 2026 review agrees that management in pregnancy starts with non-drug measures and iron repletion (Jung KY, Sleep Med Clin, 2026, PMID 42161455). Here is how that translates into everyday life.
1. Ask for your iron to be checked
If you have not had a recent blood test, ask your doctor for haemoglobin and ferritin. This is the single most useful step, because it points to the one cause that has a clear treatment. If your iron is low, your doctor will advise the right supplement.
2. Move during the day
Regular, gentle activity that your doctor is happy for you to do, such as an evening walk after dinner or prenatal yoga, is part of the guideline’s non-drug approach. Many women find a short walk in the hour or two before bed helps them settle.
3. Use movement when it strikes
Since moving relieves the feeling, use that. Get up and walk around the room, flex and point your feet, or gently stretch your calves. Some women find a warm shower or bath, or massaging the calves, helpful before bed. These have not been tested in trials, but they are gentle and you can stop if they do not suit you.
4. Look at what makes it worse for you
Keep a simple note for a week: what time the feeling starts, what you ate or drank in the evening, and how long you had been sitting still. Patterns often show up. Long periods of sitting, such as a long car journey or an evening on the sofa, are a common trigger simply because rest brings the symptoms on. Breaking those up with short walks can help.
5. Tell your doctor which medicines you take
Some medicines can make restless legs worse, and the guideline’s advice to avoid exacerbating factors includes reviewing them. Do not stop anything you have been prescribed; just make sure your doctor has the full list, including anything for allergies, nausea or sleep.
6. Protect your sleep in other ways
A regular bedtime, a cool and dark room, and a wind-down routine all help, and they matter even more when restless legs are cutting into your nights. Our guide to insomnia in pregnancy has practical sleep strategies that are safe in pregnancy.
What about medicines for restless legs?
The guideline rated medicines for restless legs by their risks and benefits in pregnancy and breastfeeding, and only a few are rated as “may be considered”, and only when symptoms are severe and have not responded to more conservative approaches (Picchietti DL et al., Sleep Med Rev, 2015, PMID 25553600). The 2026 review similarly keeps the medicines used for restless legs outside pregnancy as last-line options in pregnancy (Jung KY, Sleep Med Clin, 2026, PMID 42161455). In practice, most women are managed with iron and the measures above. If yours is severe, this is a decision for your doctor, made with you, weighing your sleep against the medicine.
Please do not take sleeping tablets or any over-the-counter “leg relief” product in pregnancy without asking your doctor first.
When to Mention It to Your Doctor
Mention restless legs at your next antenatal visit or consultation if:
- They are breaking your sleep on several nights a week
- They started in pregnancy and you have not had a recent iron check
- You have had restless legs before, or someone in your family has
- You have other signs of low iron, such as tiredness that feels out of proportion, breathlessness on stairs, or looking pale
Get checked the same day if what you have does not fit the pattern of restless legs, especially pain, swelling, warmth or redness in one calf, because that needs to be examined for a clot. Our post on leg cramps during pregnancy explains the clot warning signs clearly.
What Happens After the Baby Arrives?
For most women, this is the most reassuring part. In the meta-analysis, the rate of restless legs dropped from 22% in the third trimester to 4% after delivery (Chen SJ et al., Sleep Med Rev, 2018, PMID 29169861). The 2026 review also notes that restless legs in pregnancy typically resolve after delivery (Jung KY, Sleep Med Clin, 2026, PMID 42161455).
The same review notes that women who have had restless legs in pregnancy have a higher chance of developing them again later in life. That is simply useful to know: if the feeling returns in a future pregnancy or years from now, you will recognise it, and an iron check is again a sensible first step.
If restless legs carry on for weeks after your baby is born, mention them at your postnatal check. Iron stores are often low after delivery, and our post on postpartum anaemia covers why that is easy to miss.
Practical Takeaways
- Restless legs affect about one in five pregnant women, most often in the third trimester.
- The feeling is an urge to move that comes with rest, eases with movement, and is worse at night.
- Low iron is a consistent risk factor, so ask for haemoglobin and ferritin to be checked.
- Start with gentle daytime activity, movement when symptoms strike, and good sleep habits.
- Do not start iron, sleeping tablets or leg-relief products without your doctor’s advice.
- One-sided calf pain, swelling or warmth is different and needs a same-day check.
- For most women, restless legs settle after delivery.
Frequently Asked Questions
Is restless legs syndrome common in pregnancy?
Yes. A meta-analysis of 27 studies with over 51,000 pregnant women found that about 21% had restless legs, rising to 22% in the third trimester. It is one of the most common reasons for disturbed sleep in late pregnancy.
Does low iron cause restless legs in pregnancy?
Iron deficiency is one of the consistent risk factors for restless legs in pregnancy, alongside family history and previous pregnancies. Not every woman with restless legs has low iron, but it is the most useful thing to check because it can be treated. Ask your doctor for haemoglobin and ferritin.
Can restless legs harm my baby?
Restless legs affect your comfort and your sleep. The main reason to treat them is to get your nights back, and good sleep matters for you in pregnancy. Mention it to your doctor so you can work on it together.
Which trimester do restless legs start in?
They can start at any time, but they become more common as pregnancy goes on: about 8% of women have them in the first trimester, 16% in the second and 22% in the third, according to the pooled data.
Will restless legs go away after delivery?
For most women, yes. The rate falls to about 4% after delivery. If symptoms carry on for weeks after the birth, mention them at your postnatal check, since iron stores are often low after delivery.
Can I take magnesium for restless legs in pregnancy?
Magnesium is often suggested online, but there is little good research on it for restless legs in pregnancy, and the pregnancy trials of magnesium for leg cramps gave inconsistent results. Do not start any supplement without asking your doctor. Checking your iron is a better first step.
What is the difference between restless legs and leg cramps?
A cramp is a sudden, painful tightening of the muscle that lasts seconds to minutes and eases with stretching. Restless legs are an uncomfortable urge to move that builds while you rest and eases while you keep moving. The table above sets out the differences.
Talking It Through
Restless legs can make the last months of pregnancy feel very long, especially when everyone around you is asleep and you are pacing the floor. The good news is that the first steps are simple: an iron check, some gentle movement, and a plan for your sleep.
💜 Want help with restless legs or sleep in your pregnancy? Message Dr. Suganya on WhatsApp to book a ₹399 video consultation, available online across India. You can also download our free pregnancy guide for trimester-by-trimester support.
