Restless legs syndrome (RLS) during pregnancy is more common than many women realise. Characterised by an uncomfortable, often irresistible urge to move the legs — typically worsening at rest and in the evening — RLS can significantly disrupt sleep during pregnancy, compounding the fatigue that many pregnant women already manage. For women pregnant after 35, the overlap of age-related vulnerabilities and pregnancy-specific factors may increase both the likelihood and the impact of symptoms.
This article draws on current research to explain what is known about RLS in pregnancy, why it may be particularly relevant later in reproductive life, and what evidence suggests about approaches to managing it. As always, any persistent symptoms warrant discussion with a healthcare provider who can assess your individual situation.
What Research Shows About RLS in Pregnancy
According to the National Institute of Neurological Disorders and Stroke, RLS during pregnancy affects an estimated 10–34% of pregnant women, making it one of the more common sleep disruptions in this period. Symptoms typically intensify in the third trimester, though they can appear at any stage. Research indicates that pregnancy-related RLS often resolves after delivery — which distinguishes it from chronic RLS — though some women experience persistence of symptoms, particularly if underlying contributing factors are not addressed.
The mechanisms linking pregnancy to RLS are not fully understood, but current research points to several contributing pathways. Understanding these helps explain both why RLS occurs and why certain management approaches have a rationale.
Why Pregnancy Increases RLS Risk
Hormonal Changes
Rising levels of oestrogen and progesterone during pregnancy are thought to affect the dopaminergic system — the neurological pathway most closely implicated in RLS. Dopamine plays a role in regulating movement and the sensory discomfort associated with RLS, and hormonal fluctuations may sensitise this system in ways that increase symptom likelihood. This hormonal contribution may also explain why RLS often improves rapidly after delivery, as hormone levels normalise.
Iron and Folate Status
Iron deficiency is among the most well-established modifiable risk factors for RLS generally, and pregnancy increases iron demand substantially. Research links iron-deficiency anaemia during pregnancy to higher rates and greater severity of RLS symptoms. Folate (folic acid) deficiency has also been associated with RLS in some studies. These are clinically relevant connections because both iron and folate status are routinely monitored during prenatal care — and deficiencies, when identified, can often be addressed. Any supplementation should be guided by actual blood test results and healthcare provider recommendation, rather than assumed need.
Why This May Be More Relevant After 35
Women pregnant after 35 may face a slightly different risk profile for pregnancy-related RLS for several reasons. Iron stores can be lower after previous pregnancies or due to heavier menstrual cycles in the years before pregnancy. Sleep quality is also generally more vulnerable to disruption after the mid-30s, meaning that when RLS does occur, its impact on overall rest may be more pronounced. Research on how pregnancy affects sleep after 35 points to multiple overlapping sources of sleep disruption — and RLS can compound these significantly.
Additionally, women in this age group are more likely to be managing other health considerations during pregnancy — including conditions associated with iron depletion — which may increase the relevance of nutritional monitoring. The broader context of pregnancy after 35: what to expect provides useful background on how prenatal monitoring tends to differ at this life stage.
Evidence-Based Approaches to Managing Symptoms
Nutritional Assessment
If blood tests indicate iron or folate deficiency, addressing these under medical guidance is a rational first step. Research on iron supplementation and RLS symptom improvement shows some support for this connection, though the effect varies by individual and by the degree of deficiency. Supplementation decisions should always be based on blood test results and clinical assessment rather than self-directed guessing.
Sleep and Lifestyle Measures
Several non-pharmacological approaches have observational evidence or are included in clinical guidance for pregnancy-related RLS. Moderate exercise during the day, maintaining consistent sleep and wake times, reducing caffeine intake, and stretching or walking before bed are all frequently mentioned. Warm baths and leg massage are common comfort measures. Evidence here is largely observational rather than from controlled trials, and individual responses vary considerably.
Medication
Pharmacological management of RLS during pregnancy is approached cautiously, given limited safety data for most RLS medications in pregnant populations. If symptoms are severe, persistent, and significantly affecting sleep and quality of life, a conversation with your OB/GYN or a sleep specialist about whether any treatment options are appropriate in your specific case is the right course of action.
Frequently Asked Questions
Is RLS during pregnancy harmful to the baby?
RLS itself is not associated with direct harm to the pregnancy or baby. Its primary impact is on the mother’s sleep quality and wellbeing. However, significant sleep deprivation during pregnancy has its own implications for health and recovery, which is why persistent or severe RLS warrants professional assessment rather than just tolerance.
Will RLS go away after delivery?
For most women, pregnancy-related RLS resolves after delivery as hormone levels normalise. Research suggests the majority of cases are pregnancy-specific rather than representing a chronic underlying condition. Some women do experience persistence postpartum, particularly if contributing factors such as iron deficiency remain unresolved.
Should I take iron supplements if I think I have RLS?
Iron supplementation is appropriate when blood tests confirm iron deficiency — not as a blanket response to RLS symptoms. Your prenatal care provider will typically monitor iron levels through routine blood work. If deficiency is identified, supplementation under their guidance is a reasonable step. Self-supplementing without confirmed deficiency is not generally recommended and may cause gastrointestinal side effects.
Key Takeaways
- RLS during pregnancy affects a significant proportion of pregnant women and is among the more common causes of sleep disruption in this period.
- Iron and folate deficiency are established contributing factors, and routine prenatal blood monitoring helps identify these.
- Women pregnant after 35 may be more susceptible due to lower iron stores, age-related sleep vulnerability, and other health factors.
- Most pregnancy-related RLS resolves after delivery; persistence postpartum may signal an underlying factor worth investigating.
- Symptoms that significantly affect sleep or quality of life warrant a conversation with a healthcare provider.
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.