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Restless legs syndrome: symptoms, diagnosis and modern treatment
At a glance
What is it?A neurological condition with a strong urge to move the legs, usually linked to uncomfortable sensations during rest.
Main symptomRestless legs at rest, especially in the evening and at night. Movement eases the symptoms, while disturbed sleep stays the main problem.
Common causeLow iron stores. This is one of the most important treatable causes and is checked first.
ImportantThe iron check comes before medication. Drug therapy is kept at a low dose on purpose, to avoid a worsening known as augmentation.
What is restless legs syndrome?
Restless legs syndrome (RLS) is one of the most common neurological conditions. About 5 to 10 percent of people are affected, and the frequency rises with age. Only around 1 to 2 percent, however, need treatment. The hallmark is an almost irresistible urge to move the legs, usually with uncomfortable sensations such as pulling, tingling, tension or pain. Typically the symptoms occur at rest and get worse in the evening and at night. Many people also have periodic leg movements during sleep.
There are two forms. Primary RLS is often inherited and occurs without an identifiable underlying condition. Secondary RLS is the result of another cause, most often low iron stores, and also kidney disease or certain medications. This distinction matters, because in secondary RLS treating the cause can clearly ease or even end the symptoms.
Capture the pattern of your symptoms
The diagnosis relies on a typical pattern: rest, worsening in the evening and relief through movement. A short symptom diary helps you and your doctor recognise this pattern. With brite you record it in one place, free of charge.
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Symptoms: how do I recognise RLS?
The picture follows a clear pattern, often described as URGE:
A strong urge to move the legs, usually with uncomfortable sensations deep in the leg
Triggered or worsened by rest, that is, when sitting or lying down
Noticeable relief as soon as you move, stand up or stretch the legs
A clear worsening in the evening and at night
Because the symptoms mainly occur at rest and at night, sleep suffers considerably. Many people are exhausted, unfocused and low in mood during the day. This disturbed sleep is often the reason people seek help, and it makes RLS more than just a problem of the legs.
The five diagnostic criteria (by the IRLSSG)
RLS is diagnosed mainly in conversation, not by a single device. The international study group IRLSSG has defined five criteria, all of which must be met:
Urge to move the legs:A strong, almost irresistible urge to move the legs, usually together with uncomfortable sensations.
Triggered by rest:The symptoms begin or worsen at rest, that is, when sitting or lying down.
Relief through movement:Standing up, walking around or stretching eases the symptoms, at least as long as the movement continues.
Worse in the evening and at night:The symptoms are stronger in the evening and at night, or occur only then.
No other explanation:The symptoms are not better explained by another cause, such as leg cramps, circulation problems or an uncomfortable position.
The work-up also includes a blood test of the iron values and ruling out other conditions. A sleep laboratory study is only needed in special cases.
Iron first: why the iron check comes at the start
One point separates good RLS care from quick tips: it does not start with a sleeping pill, but with a look at iron metabolism. Iron plays an important role in the brain, and low iron stores can trigger or worsen RLS. That is why the iron values, above all ferritin, should be measured at diagnosis, at the start of treatment and when symptoms get worse.
The current guideline is specific here:
For mild RLS and a ferritin value of 75 micrograms per litre or below, iron should be given as tablets, often as ferrous sulfate together with vitamin C for better absorption.
For moderate to severe RLS, or if tablets are not tolerated, iron can be given through a vein.
Often the symptoms improve simply by replenishing the iron stores, without any further medication. Iron supplements belong in medical hands, though, as too much iron can be harmful. Do not take them on your own over the long term.
Medication: the treatment steps
If iron treatment is not enough or the iron values are normal, a stepwise approach follows. The principle is: as low and as late as possible, to avoid a later worsening.
Step 1, the basis:Iron for low values, plus non-drug measures such as regular movement, good sleep hygiene and avoiding caffeine, alcohol and nicotine in the evening. Medicines that can worsen RLS are also reviewed.
Step 2, the first drug choice:Either a gabapentinoid (for example gabapentin or pregabalin) or a low-dose dopamine agonist (rotigotine as a patch, ropinirole or pramipexole). Internationally, dopamine agonists are used more cautiously because of the augmentation risk, and gabapentinoids are gaining importance.
Levodopa only short term:Levodopa should no longer be used for continuous therapy, only for occasional symptoms or to confirm the diagnosis, because the risk of augmentation is high.
Step 3, the second choice:For augmentation or when previous therapy fails, slow-release opioids can be used in moderate to severe RLS, with specialist supervision.
And a common misunderstanding that many guides repeat: cannabinoids, magnesium and benzodiazepines have no proven benefit in RLS in studies.
Watch out for augmentation
Under continuous dopaminergic therapy, augmentation can occur, a paradoxical worsening: the symptoms start earlier in the day, become stronger or spread to the arms and trunk. In that case, do not raise the dose on your own, but talk to your doctor. This is exactly why the dose is kept as low as possible and the course is closely monitored.
Keep track of the course
Documenting changes over weeks helps you notice augmentation early and take medication safely. brite reminds you of iron or your RLS medicines and checks for interactions.
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Frequently asked questions about restless legs syndrome
In the moment, standing up, walking around and stretching help, sometimes cool or warm stimuli too. But this only eases things briefly. In the long term you need a diagnosis and, depending on the cause, iron treatment or medication.
Primary RLS, which is often inherited, is not curable but treatable. Secondary RLS, for example from iron deficiency, can resolve when the cause is corrected.
A central one. Low iron stores are a common and treatable cause. That is why the iron value (ferritin) is measured at the start, and for low values iron is given first.
Iron first, if the values are low. If that is not enough, gabapentinoids or low-dose dopamine agonists are options. Levodopa is now only used short term. For augmentation or treatment failure, opioids are an option, always with specialist care.
A paradoxical worsening from continuous dopaminergic therapy: the symptoms start earlier in the day, become stronger or spread. The key is not to raise the dose yourself, but to speak to your doctor.
Among others, certain antidepressants, some antihistamines and medicines that block dopamine, such as some anti-nausea drugs. So have your medicines reviewed by a doctor.
According to the current guideline, there is no proven benefit for magnesium. The same applies to cannabinoids and benzodiazepines.
RLS is not life-threatening. The disturbed sleep can, however, strongly affect quality of life, so it should be assessed and treated.
Heidbreder A., Trenkwalder C. et al.: Restless Legs Syndrome, S2k guideline, 2022, DGN and DGSM, AWMF register 030/081.
International Restless Legs Syndrome Study Group (IRLSSG): diagnostic criteria, consensus 2014.
American Academy of Sleep Medicine (AASM): Clinical Practice Guideline RLS, 2024.
German Restless Legs Association (RLS e. V.): patient information (2025).
This article is for general information only and does not replace medical advice, diagnosis or treatment. Take iron supplements and prescription medicines only after medical advice. For persistent or worsening symptoms, please contact a medical practice.
