Often caused by low iron — and correcting it properly resolves a great many cases.
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Restless legs syndrome is a neurological condition, not a habit or a nervous tic. It produces an irresistible urge to move the legs, usually with an unpleasant sensation described as crawling, fizzing, aching or something moving inside the leg — difficult to put into words, which is part of why it goes unreported.
It affects around one in twenty people to a degree that needs treatment, and it is a substantial cause of insomnia — because it strikes precisely when you settle down for the night.
Two things on this page matter more than anything else.
Iron. Restless legs is strongly linked to low iron in the brain, and treatment is guided by a much higher threshold than usual. Ferritin should be above 75, and ideally above 100 — far above the level at which a laboratory stops flagging it. This means a great many people are told their iron is "normal" while sitting at exactly the level that is causing their symptoms. Correcting it resolves the problem for a substantial proportion.
Augmentation. The drugs most commonly prescribed for restless legs for two decades — pramipexole and ropinirole — can make the condition progressively worse over time. That is now well recognised, and they are no longer first choice.
All four are needed for the diagnosis:
That last point is genuinely diagnostic. Symptoms following a daily rhythm, arriving reliably in the evening, separate restless legs from almost everything else.
Crawling, fizzing, tingling, pulling, aching, electric, or "like something moving under the skin". It is usually deep within the leg rather than on the surface, and it is more often uncomfortable than painful — which is why people struggle to explain it and sometimes give up trying.
It affects both legs in most people, and can involve the arms.
Many people also have periodic limb movements in sleep — repetitive leg jerks during the night, often noticed by a partner rather than the person. They fragment sleep without waking you properly, which is why the tiredness can seem out of proportion.
Low iron in the brain reduces dopamine function, which is the current understanding of the mechanism. Crucially, this happens at iron levels considered normal by ordinary standards, and without any anaemia. Blood iron and brain iron are not the same thing, which is why the treatment threshold is set so much higher.
This is a common and reversible cause, and it is worth reviewing before anything is added:
Caffeine, alcohol, nicotine, sleep deprivation, and prolonged immobility — long flights, long meetings.
Restless legs is a clinical diagnosis, made on the four features above. No scan or test confirms it — which makes it well suited to a remote consultation, since the diagnosis is entirely in the history.
Ferritin — and the number matters, not the word "normal".
For restless legs, iron replacement is recommended where ferritin is below 75 µg/L, with many specialists aiming above 100. Most UK laboratories flag ferritin as low only below around 15 to 30. So someone with a ferritin of 40 will be told their iron is fine, while sitting well within the range that causes symptoms.
Ask for the actual figure. This single point is the most useful thing on this page.
If ferritin is below 75, iron replacement is the first treatment, whether or not you are anaemic. Taken on alternate days, which absorbs better than daily dosing, with vitamin C and away from tea, coffee and calcium.
Allow three months before judging it — brain iron takes longer to replenish than blood iron. For a meaningful proportion of people this resolves the condition without any other treatment, and it is the step most often skipped.
Reviewing antidepressants, antihistamines and anti-sickness medication. Where an antidepressant is responsible, alternatives exist that are far less likely to provoke it — this needs discussing with whoever prescribes it rather than stopping.
Alpha-2-delta ligands — gabapentin or pregabalin — are now generally preferred as first-line drug treatment, particularly where symptoms are painful or sleep is badly affected.
Dopamine agonists such as pramipexole and ropinirole are no longer first choice, and the reason is important:
With long-term dopamine agonist treatment, symptoms can paradoxically worsen. Specifically:
The natural response — increasing the dose — makes it worse. If you are on pramipexole or ropinirole and any of that describes you, please raise it rather than assuming your condition is progressing. It needs a planned change of treatment, not a dose increase.
These drugs also carry a risk of impulse control problems — gambling, shopping, compulsive eating or hypersexuality — which people are frequently not warned about and rarely connect to a tablet for their legs. It is worth asking about directly.
Most treatments are avoided. Iron replacement is the mainstay and is often effective, alongside the practical measures below. It usually resolves after delivery.
Restless legs is not dangerous and is rarely urgent. Seek prompt assessment for:
Book a consultation if:
These need a planned change of treatment. Do not simply increase the dose, which makes augmentation worse.
Do not start iron without having your ferritin measured first. Iron overload is harmful, and some people carry a genetic condition that makes supplementation actively dangerous. Test, then treat.
The most useful thing about restless legs is a blood test, and it is cheap.
Iron deficiency is a major and treatable driver of restless legs, and the threshold used is much higher than for ordinary anaemia — a ferritin below 75 µg/L warrants iron replacement in restless legs, even though that figure would be called normal in most other contexts. That distinction is regularly missed, and people are told their iron is fine when by restless legs standards it is not.
A ferritin test and a course of iron is free on the NHS and frequently resolves it.
The second most useful thing is a medication review, also free. Several common drugs cause or worsen restless legs — most antidepressants including SSRIs and mirtazapine, older sedating antihistamines, some antipsychotics and antiemetics such as metoclopramide. Changing one is sometimes the whole treatment.
Where a consultation earns its fee is the warning about dopamine agonists. Drugs like pramipexole and ropinirole work initially, but augmentation — where symptoms become earlier, more intense and spread to the arms — develops in a substantial proportion over time and is difficult to reverse. Current specialist practice has moved toward alpha-2-delta ligands such as gabapentin first for that reason, and this is genuinely not widely known.
Free and effective: reducing caffeine and alcohol, regular moderate exercise, and stretching.
NICE Clinical Knowledge Summary, Restless legs syndrome, is the principal reference. It recommends checking serum ferritin and offering iron replacement where ferritin is below 75 µg/L, which is above the threshold used for iron deficiency anaemia — the basis for the point above.
CKS recommends reviewing medications that may exacerbate symptoms, listing antidepressants, antihistamines, antipsychotics and dopamine antagonists.
CKS covers pharmacological treatment for persistent troublesome symptoms, and warns explicitly about augmentation with dopamine agonists, recommending specialist advice where it occurs.
International restless legs syndrome guidance — including from the IRLSSG and the American Academy of Sleep Medicine — now favours alpha-2-delta ligands over dopamine agonists as initial therapy because of the augmentation risk.
CKS also covers secondary causes, including pregnancy, chronic kidney disease and peripheral neuropathy.
Because the target for restless legs is far higher than the laboratory cut-off. Most labs flag ferritin as low below around 15 to 30; for restless legs, replacement is recommended below 75, and many specialists aim above 100. A ferritin of 40 gets reported as normal while sitting squarely in the range that causes symptoms. Ask for the number.
Around three months before you can judge it. Brain iron replenishes more slowly than blood iron, so the improvement is gradual rather than immediate — and people frequently give up at six weeks, just before it would have helped.
If you take pramipexole or ropinirole, this may be augmentation — where the drug itself causes symptoms to worsen, start earlier in the day, and spread to the arms. It is well recognised and it is the reason these are no longer first-choice treatment. The answer is a change of drug, not a higher dose, which makes it worse.
No — and this catches people out. Sedating antihistamines, including those in over-the-counter sleep remedies, make restless legs considerably worse. Taking them for the insomnia that restless legs is causing is a common and entirely counterproductive sequence.
No. It does not damage the legs or nerves and does not shorten life. What it does is wreck sleep, and the exhaustion that follows has real consequences for mood, concentration and driving. It is worth treating properly rather than enduring.
Quite possibly — mirtazapine in particular, and most SSRIs and SNRIs. It is a common and reversible cause. Do not stop the antidepressant yourself, but do raise it: alternatives exist that are far less likely to provoke restless legs.
Usually, yes — restless legs in pregnancy is common, particularly in the third trimester, and typically settles after delivery. Iron deficiency is frequently part of it, and treating that is both safe and often effective while pregnant.
No. Restless legs is a recognised neurological condition with an understood mechanism involving iron and dopamine in the brain. The difficulty people have describing the sensation — and the fact that it disappears the moment you move — makes it sound vague, which is why it is so often dismissed. It is entirely real and it is treatable.
August 23, 2026
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