Up to 7 to 8 percent of people experience restless leg syndrome at some point, and around 2 to 3 percent have symptoms severe enough to need medical treatment. That puts it roughly on par with conditions like migraine in terms of prevalence, yet it rarely gets the same recognition. The condition is often dismissed as a bad habit, a sign of stress, or something to sleep off, and people commonly spend years bouncing between explanations, growing pains as a child, restless sleep as an adult, poor circulation later in life, before anyone names what’s actually happening. Part of the problem is that the symptoms are genuinely hard to put into words. Part of it is that many doctors outside of sleep medicine simply aren’t trained to recognise the pattern.

The pattern itself is distinctive once you know what to look for. An unbearable pull or crawling sensation sets in as soon as you lie down, easing only once you get up and walk around, then building right back up the moment you sit still again. Anyone who has been through a few nights of this recognises it immediately, and anyone who hasn’t often struggles to understand why “just relax” doesn’t work.

Key Takeaways

Restless leg syndrome affects up to 7 to 8 percent of people, with 2 to 3 percent experiencing symptoms severe enough to need treatment, according to studies.
There’s no single test that confirms the condition. Diagnosis relies on symptom patterns, blood work, and ruling out other causes.
Low brain iron is one of the most common and most treatable contributing factors.
Restless leg syndrome can be primary, with no identifiable cause, or secondary, linked to conditions such as pregnancy, kidney disease, or iron deficiency.
There’s no outright cure, but most people see substantial improvement with the right combination of treatment and lifestyle changes.

What Is Restless Leg Syndrome

Restless leg syndrome, often shortened to RLS, is a neurological condition that produces an overwhelming urge to move the legs, usually paired with an uncomfortable sensation deep in the muscles. The discomfort tends to build while sitting or lying still and eases, at least temporarily, with movement. It’s classified as both a sleep disorder and a movement disorder, since it disrupts rest and forces the body into motion at the exact moment it should be winding down.

Willis-Ekbom Disease

Restless leg syndrome carries a second, less common name: Willis-Ekbom disease. English physician Sir Thomas Willis described symptoms consistent with the condition as far back as the 17th century, noting patients who experienced leg movements and discomfort that kept them from resting. It wasn’t formally characterised as a distinct neurological syndrome until the 1940s, when Swedish neurologist Karl A. Ekbom studied it in detail and established the diagnostic framework still used today. His name was added to the condition in recognition of that work, and both terms remain in clinical use.

Types of Restless Leg Syndrome

Doctors generally divide RLS into two categories based on when it starts and what drives it.

Early-onset, primary or idiopathic RLS: symptoms begin before age 45, often run in families, and have no identifiable underlying cause. This form tends to progress slowly over decades.
Late-onset or secondary RLS: symptoms begin after age 45 and are usually linked to an underlying condition such as iron deficiency, kidney disease, or pregnancy. This form tends to progress more quickly, though treating the underlying cause often improves or resolves it.

Knowing which type you have matters for treatment. Primary RLS is typically managed long term with medication and lifestyle adjustments, while secondary RLS often responds well once the root cause is addressed.

RLS vs Periodic Limb Movement Disorder

RLS and periodic limb movement disorder (PLMD) are frequently confused because they overlap so often. The distinction comes down to awareness and timing. RLS is a waking phenomenon. You feel the urge to move while you’re conscious and trying to rest, and the movement is voluntary, a deliberate attempt to relieve the discomfort. PLMD, by contrast, involves involuntary jerking or twitching movements that happen during sleep itself, typically every 15 to 40 seconds, and the person is often unaware they’re happening at all. A bed partner is usually the one who notices.

The overlap is significant. Most people with RLS also experience periodic limb movements during sleep, but the reverse isn’t true. Plenty of people have PLMD without ever experiencing the waking urge to move that defines RLS.

Other Conditions Often Confused with RLS

A number of other conditions produce leg discomfort that can be mistaken for restless leg syndrome, which is part of why misdiagnosis is so common.

Nocturnal leg cramps: sudden, painful muscle contractions, usually in the calf, that come on sharply and resolve with stretching. Unlike RLS, cramps don’t involve an urge to move before the pain starts, and they aren’t tied to a pattern of worsening at rest.
Peripheral neuropathy: nerve damage, often from diabetes, that can cause tingling, burning, or numbness in the legs and feet. It tends to be constant rather than triggered specifically by rest, and it doesn’t reliably improve with movement the way RLS does.
Poor circulation and positional discomfort: an awkward sitting position or reduced blood flow to the legs that can cause temporary numbness or an urge to shift position. This resolves quickly and doesn’t follow the evening and nighttime pattern typical of RLS.
Akathisia: a side effect of certain medications, particularly antipsychotics, that produces inner restlessness and a need to move. It can closely mimic RLS but is usually generalised across the whole body rather than concentrated in the legs.

The distinction matters because the treatments differ substantially. A magnesium supplement that helps a cramp won’t relieve RLS symptoms, and a dopamine-based RLS medication won’t help neuropathy.

Restless Leg Syndrome Symptoms

RLS symptoms show up differently from person to person, and the way people describe them varies just as much. The table below explains what each symptom is and what it actually feels like.

Symptom	What It Actually Feels Like
Crawling or creeping sensation	A feeling like something is moving under the skin, often described as insects crawling along the muscle
Aching or throbbing	A deep, dull ache similar to muscle fatigue, usually in the calves but sometimes reaching the thighs
Itching under the skin	An itch that can’t be scratched away because it originates below the skin’s surface, in the muscle itself
Electric shock or tingling	Sudden, brief jolts of sensation, similar to pins and needles but sharper
Pulling sensation	A tugging feeling as though the muscle is being stretched or drawn from within
Worsening at rest	Symptoms building the longer you sit or lie still, often noticeable on long flights, during meetings, or once you settle into bed
Relief with movement	Symptoms easing, often within seconds, once you stand, walk, or stretch the affected limb
Evening and nighttime pattern	Symptoms that are mild or absent in the morning and steadily worsen through the afternoon and evening

Most people experience symptoms in both legs, though one side can be more affected than the other. Less commonly, the sensations extend to the arms, and rarely they reach the torso.

What Causes Restless Leg Syndrome

There’s no single, confirmed cause of restless leg syndrom, but research points to several contributing factors that often overlap.

Primary RLS and Genetic Factors

Roughly half of people with primary RLS have a close family member with the condition, and several gene variants have been linked to it through genome-wide studies. Genetic RLS tends to appear earlier in life and progresses more gradually than the secondary form, though the underlying mechanism connecting genetics to symptoms is still being studied.

Secondary RLS and Underlying Conditions

When RLS develops later in life without a family history, it’s often connected to another medical condition. Spinal cord conditions, including spinal stenosis and nerve root compression, have been linked to RLS, as has Parkinson’s disease, since both conditions involve disruptions to dopamine signalling in the brain. Multiple sclerosis and certain autoimmune conditions are also associated with higher rates of RLS.

Iron Deficiency and Dopamine Pathways

Iron plays a central role in the current understanding of RLS. The brain uses iron to help produce and regulate dopamine, a chemical messenger involved in controlling smooth, purposeful movement. When iron levels are low, even in people whose blood iron levels test as normal, dopamine signalling can become disrupted, which is thought to trigger the abnormal urge to move that defines RLS. This is why iron studies are one of the first steps in diagnosis, and why correcting an iron deficiency is often the single most effective treatment for people whose RLS stems from this cause.

RLS is common during pregnancy, particularly in the third trimester, affecting a meaningful portion of pregnant women. The likely drivers are a combination of falling iron and folate levels, hormonal shifts including rising oestrogen, and the general physical strain of late pregnancy on circulation. The good news is that pregnancy-related RLS typically resolves within weeks of delivery as iron levels and hormones return to baseline.

Chronic Kidney Disease and Neuropathy

End-stage kidney disease is one of the strongest known risk factors for secondary RLS, with prevalence rates among dialysis patients running dramatically higher than in the general population. The mechanism is thought to involve a combination of iron deficiency, anaemia, and the build-up of toxins that the kidneys would normally filter out. Peripheral neuropathy, often linked to diabetes, is a separate but related risk factor, since nerve damage in the legs can contribute to the same dopamine and sensory disruptions seen in other forms of RLS.

Triggers and Risk Factors

Beyond the underlying causes, several factors are known to trigger or worsen RLS symptoms in people who are already prone to the condition.

Medications that worsen symptoms: certain antidepressants, particularly SSRIs, along with antihistamines and some antipsychotic medications, are known to trigger or intensify RLS symptoms.
Caffeine, alcohol and nicotine: all three are linked to worsening symptoms, likely through their effects on sleep quality, circulation, and dopamine regulation.
Sleep deprivation and irregular sleep patterns: a lack of consistent, quality sleep worsens RLS severity. The condition disrupts sleep, and the resulting sleep deprivation then makes symptoms worse, a cycle that’s hard to break without addressing both sides of it.

How Restless Leg Syndrome Affects Sleep

Restless leg syndrom is often thought of as a bedtime problem, something that shows up at lights out and disappears once you’re asleep. In practice, its reach extends much further.

Sleep Onset Insomnia

RLS symptoms typically peak in the evening and at night, right as the body should be settling down. This produces a form of sleep onset insomnia for many people with the condition, sometimes stretching the time it takes to fall asleep to well over an hour. Some people describe a nightly routine of pacing the room, stretching, or getting up repeatedly just to quiet the sensation enough to lie back down, only for it to return within minutes.

Periodic Limb Movements

Most people with RLS also experience periodic limb movements during sleep, involuntary jerks in the legs that occur every 15 to 40 seconds and can continue for hours. These movements fragment sleep architecture throughout the night, pulling the body out of deeper sleep stages even when the person doesn’t wake up fully or remember the movements the next morning. A bed partner is often the first to notice, describing kicking or twitching that the person themselves had no idea was happening.

Daytime Fatigue and Cognitive Impact

The combination of delayed sleep onset and fragmented sleep adds up. People with moderate to severe RLS commonly report daytime fatigue, difficulty concentrating, and a general sense of being worn down, even after what looks on paper like a full night in bed. Tasks that require sustained focus, driving long distances, sitting through meetings, or working through detailed paperwork, can feel far harder than they should.

Anxiety and Depression

Chronic sleep disruption is closely tied to mood. Studies consistently find higher rates of anxiety and depression among people with RLS compared to the general population, and the relationship appears to run in both directions. Poor sleep worsens mood, and heightened stress or anxiety can, in turn, intensify RLS symptoms, making the two difficult to untangle once they’ve taken hold together.

RSL Diagnosis and Testing

RLS can be frustrating to get confirmed, since there’s no single test that diagnoses it outright. Diagnosis instead comes together through a combination of symptom patterns, blood work, and, where needed, an overnight study.

Clinical Diagnostic Criteria

There’s no blood test or scan that can diagnose RLS on its own. Diagnosis instead relies on five established clinical criteria, all of which need to be present.

An urge to move the legs, usually accompanied by an uncomfortable sensation
Symptoms that begin or worsen during periods of rest or inactivity
Symptoms that are partially or fully relieved by movement, for as long as the movement continues
Symptoms that are worse in the evening or at night compared to earlier in the day
Symptoms that aren’t better explained by another medical or behavioural condition

A sleep specialist works through this checklist alongside a detailed medical history, as accurately identifying the pattern is the foundation of getting the diagnosis right. Family history, current medications, and any existing conditions such as kidney disease or diabetes all factor into that assessment.

Blood Tests and Ferritin Levels

Given how strongly iron is tied to RLS, blood tests are a standard part of the diagnostic process. Ferritin, which reflects the body’s iron stores, is checked specifically, since ferritin levels that would be considered normal for general health can still be too low to support healthy dopamine function in the brain. A basic metabolic panel is also common, to check kidney function and rule out other contributing conditions. In some cases, thyroid function is checked too, since thyroid imbalances can produce symptoms that overlap with RLS.

Polysomnography and Overnight Studies

An overnight sleep study, or polysomnogram, isn’t required to diagnose RLS itself, but it’s often used to confirm periodic limb movements, measure how badly sleep is being disrupted, and rule out other sleep disorders that might be contributing to symptoms, such as sleep apnea. The study tracks brain activity, breathing, oxygen levels, and limb movement across a full night, giving a much clearer picture than symptoms alone can provide.

Differential Diagnosis

Many conditions can mimic RLS that ruling out alternatives is a key part of the diagnostic process. This includes checking for peripheral neuropathy through nerve conduction studies where relevant, reviewing current medications for known triggers, and considering conditions such as diabetes or thyroid dysfunction that can produce overlapping symptoms. Getting this step right is often what separates an accurate RLS diagnosis from years of chasing the wrong treatment.

Restless Leg Syndrome Treatment and Management

Treatment is generally approached in stages, starting with the options that carry the lowest risk and moving toward stronger interventions only if needed.

Category	Treatment	What It Does	Considerations
Underlying condition	Treating the root cause, such as correcting iron deficiency, adjusting medications, or managing kidney disease	Addresses secondary RLS at its source and often resolves symptoms without further treatment	Most effective for secondary RLS. Requires accurate diagnosis of the underlying condition first
First-line medication	Iron therapy, oral or intravenous	Corrects low brain iron levels, often significantly improving symptoms when ferritin is low	Requires blood testing before and during treatment. IV iron is reserved for cases where oral iron isn’t tolerated or effective
First-line medication	Alpha-2-delta ligands, including gabapentin and pregabalin	Calms overactive nerve signalling and is now widely recommended as an initial treatment option	Generally well tolerated. Can cause drowsiness, so dosing is often timed for the evening
Second-line medication	Dopamine agonists	Boost dopamine activity in the brain, effective in the short term	Carries a risk of augmentation with long-term use. Requires monitoring for worsening symptoms over time
Second-line medication	Opioids, for severe or treatment-resistant cases	Provide relief when other medications haven’t worked	Used sparingly and under close supervision due to dependency risk
Lifestyle management	Sleep hygiene adjustments	A consistent bedtime and reduced screen time can lessen the sleep deprivation that worsens RLS	Works best alongside medical treatment rather than as a stand-alone fix for moderate to severe symptoms
Lifestyle management	Exercise and stretching routines	Regular, moderate activity has been shown to reduce symptom severity for many people	Intense evening exercise can sometimes worsen symptoms, so timing matters
Lifestyle management	Heat and cold therapy	A warm bath or a cold pack applied to the legs can ease discomfort in the moment	Offers short-term relief rather than a lasting solution
Lifestyle management	Reducing caffeine and alcohol intake	Cutting back, particularly in the afternoon and evening, often lessens symptom intensity	Effects vary by person and may take a few weeks of consistent reduction to notice
Lifestyle management	Leg massage and compression	Massage may improve comfort and sleep quality, and compression devices offer relief for some people	Evidence is still limited, so results vary widely between individuals
Emerging options	Nerve stimulation devices	Deliver targeted electrical stimulation to the legs	Still being studied as a non-drug option, best discussed with a specialist before use

A sleep specialist is best placed to determine which stage is appropriate for a given case, since this depends on symptom severity, underlying cause, and how a person responds to earlier treatments.

Understanding Augmentation

Augmentation is worth understanding if dopamine agonists come up in a treatment conversation, since it’s the main reason they’ve moved to second-line status in the table above. It refers to a worsening of RLS symptoms over time as a direct result of the medication itself, rather than the underlying condition progressing on its own. Symptoms can start earlier in the day, spread to new parts of the body, or become more intense than before treatment began. This risk is why guidelines now favour alpha-2-delta ligands as a first-line option, with dopamine agonists reserved for cases where other approaches haven’t worked.

Get Relief From Restless Legs With Sleep Clinic Pretoria

If restless legs are keeping you up at night, you don’t need to keep guessing at the cause. Sleep Clinic Pretoria’s team of sleep-trained specialists can assess your symptoms, run the right tests, including iron studies and an overnight sleep study where needed, and build a treatment plan suited to what’s actually driving your RLS. Whether the answer turns out to be an iron deficiency, an underlying condition, or a medication adjustment, getting an accurate diagnosis is the fastest route to real relief. Get in touch with Sleep Clinic Pretoria to book a consultation and start finding out what’s behind your symptoms.

Frequently Asked Questions

What does restless leg syndrome feel like?

Most people describe RSL as a combination of crawling, aching, pulling, or electric sensations deep in the leg muscles, paired with an urge to move that’s difficult to resist. The exact sensation varies from person to person, which is part of why it’s often misdiagnosed.

Why do my legs feel restless when I sit still?

Legs feel restless during stillness because RLS symptoms are specifically relieved by movement. Extended stillness, on a long flight, during a meeting, or while relaxing in the evening, gives the underlying discomfort room to build unchecked.

Why can’t I keep my legs still at night?

Restless leg syndrome symptoms follow a circadian pattern and are typically at their worst in the evening and overnight. This timing lines up with when the body is trying to rest, which is exactly when the urge to move is strongest.

Why do my legs jerk right before I fall asleep?

Jerking right before sleep is often a sign of periodic limb movements, which frequently occur alongside restless leg syndrome. These involuntary jerks can happen right at the edge of sleep and may continue throughout the night, often without the person being fully aware of them.

Is restless leg syndrome hereditary?

RLS often runs in families. Around half of people with the primary form have a close family member with the condition, and researchers have identified several gene variants linked to it.

Can restless leg syndrome be diagnosed with a blood test?

No single blood test confirms restless leg syndrome on its own. Blood tests, particularly for ferritin and iron levels, are a standard part of diagnosis, since low iron is one of the condition’s most common contributing factors.

Can restless leg syndrome affect the arms?

Restless leg syndrome can affect the arms, though this is less common than leg involvement. Some people also experience symptoms in the torso, though this is rare.

Is restless leg syndrome linked to ADHD?

Restless leg syndrome and ADHD show a notable overlap. Both conditions involve dopamine-related brain function, and research has found meaningfully higher rates of restless leg syndrome symptoms among people with ADHD compared to the general population.

Is restless leg syndrome dangerous?

RLS itself isn’t life-threatening, but the sleep disruption it causes can have real effects on daytime functioning, mood, and overall quality of life if left untreated.

Can restless leg syndrome develop into something more serious?

Primary RLS doesn’t progress into another disease. Secondary RLS, however, can be a signal of an underlying condition, such as iron deficiency or kidney disease, that warrants its own attention and treatment.

Does RLS get worse with age?

Restless leg syndrome often worsens with age, particularly the primary form, since it tends to be a lifelong, progressive condition. Severity and frequency can still vary considerably from person to person.

Can RLS go away on its own?

Spontaneous remission is possible but uncommon for primary RLS. Secondary RLS, on the other hand, often improves or resolves once the underlying cause, such as an iron deficiency or pregnancy, is addressed.

Can restless leg syndrome be cured?

There’s currently no outright cure for restless leg syndrome. Most people, however, see substantial symptom improvement with the right combination of treatment and lifestyle adjustments.

What is the best treatment for restless leg syndrome?

The best treatment for RLS depends entirely on the underlying cause. Correcting an iron deficiency makes a significant difference for many people, while others benefit most from alpha-2-delta ligand medication or a combination of lifestyle changes.

Does magnesium help with restless legs?

Evidence for magnesium easing restless leg syndrome specifically is limited, and it tends to be more effective for ordinary muscle cramps. Iron levels have a far stronger evidence base as a treatable factor in restless leg syndrome.

How can I relieve restless legs syndrome?

Immediate relief from RLS often comes from movement, stretching, or a warm bath. Longer-term relief depends on identifying and treating the underlying cause, such as iron deficiency, a medication side effect, or another underlying medical condition.

What are the latest updates on restless legs syndrome?

Research continues to refine understanding of the iron and dopamine pathways involved in RLS, and treatment guidelines have shifted in recent years to favour alpha-2-delta ligands over dopamine agonists as a first-line option, largely due to the augmentation risk associated with long-term dopamine agonist use.

What Causes Restless Leg Syndrome and How to Treat It

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