Quick answer
What is restless legs syndrome?
Restless legs syndrome causes an uncomfortable urge to move the legs — often with crawling or tingling sensations — worse in the evening and at rest, relieved by movement. It disrupts sleep and is linked to iron deficiency, pregnancy, and kidney disease. Cutting caffeine and alcohol, treating low ferritin, and medicines like pramipexole help many people. See a GP if symptoms affect sleep several nights weekly.
Restless legs syndrome (RLS)
Restless legs syndrome (Willis-Ekbom disease) is a ** neurological-sensory disorder** causing an urge to move the legs — usually accompanied by uncomfortable sensations — worse at rest and worse in the evening/night.
It is a major cause of insomnia — often mislabelled as “anxiety” or “circulation problems” for years before diagnosis.
Diagnostic features (clinical)
All roughly true:
- Urge to move legs with unpleasant sensations
- Worse at rest — sitting, lying in bed
- Worse evening/night — circadian pattern
- Relief with movement — walking, stretching
- Often periodic limb movements during sleep — partner notices kicking
Frequency — symptoms ≥3 nights/week with significant distress warrants treatment.
Sensations described
Patients use vivid language:
- crawling, tingling, itching
- ” fizzy water in veins”
- deep ache
- electric shocks
Usually bilateral — both legs — sometimes arms in severe cases.
Primary vs secondary RLS
Primary (idiopathic)
- family history common
- starts before age 40
- gradual progression
- no clear cause — dopamine pathway dysfunction implicated
Secondary — treat cause first
| Cause | Mechanism |
|---|---|
| Iron deficiency | Low brain iron — check ferritin |
| Pregnancy | Third trimester — often resolves postpartum |
| Chronic kidney disease | Uraemia — dialysis patients high risk |
| Diabetes neuropathy | Nerve damage overlap |
| Parkinson’s | Shared dopamine pathways |
Medicines worsening RLS:
- antihistamines (sedating)
- SSRIs, SNRIs
- metoclopramide, prochlorperazine
- some antipsychotics
Review with GP — do not stop psychiatric medicines abruptly.
Investigation
GP orders:
- ferritin — treat if <75 mcg/L (some guidelines lower threshold) even if Hb normal
- FBC — iron deficiency anaemia
- U&E — kidney function
- HbA1c — diabetes
- medicine review
Neurology referral if atypical — asymmetric, progressive weakness, upper limb only onset.
Treatment ladder
Lifestyle
- sleep hygiene — see insomnia
- reduce caffeine and alcohol — especially evening
- moderate exercise — not late vigorous exercise
- leg massage, warm bath before bed
- pneumatic compression devices — some evidence
Iron supplementation
If ferritin low — oral iron (or IV if not tolerated) — recheck ferritin — RLS may resolve
Medicines (if symptoms persist)
| Drug class | Examples | Notes |
|---|---|---|
| Dopamine agonists | pramipexole, ropinirole | Very effective — augmentation risk with long use — symptoms spread, worsen |
| Alpha-2-delta ligands | gabapentin, pregabalin | NICE option — especially with pain overlap |
| Low-dose opioids | specialist only | Refractory cases |
Levodopa — occasional use — augmentation common — not first-line chronic.
Augmentation — important
Long-term dopamine agonists can worsen RLS — symptoms earlier in day, spread to arms — needs specialist switch to gabapentinoid.
RLS and pregnancy
Common third trimester — usually temporary:
- iron if deficient
- avoid medicines unless severe — specialist advice
- resolves postpartum in most
RLS vs other conditions
| Condition | Difference |
|---|---|
| Peripheral neuropathy | Constant numbness/burning — not purely movement-related relief |
| Leg cramps | Sudden painful muscle contraction — not urge to move |
| PAD | Exercise-induced claudication — vascular examination |
| Akathisia | From antipsychotics — inner restlessness whole body |
RLS is real, common, and treatable — if legs “won’t stay still” at night, ask GP for ferritin and structured treatment, not just sleeping tablets alone.
Common questions
- What are the symptoms of restless legs syndrome?
- Uncomfortable sensations in legs — crawling, tingling, aching, itching — with irresistible urge to move them. Worse when sitting or lying, especially evening and night. Temporary relief with walking, stretching, or rubbing. Periodic limb movements during sleep often disturb partner.
- What causes restless legs syndrome?
- Primary RLS — often genetic, starts before age 40. Secondary RLS — iron deficiency, pregnancy (especially third trimester), chronic kidney disease, diabetes neuropathy, Parkinson's disease. Medicines — antihistamines, SSRIs, metoclopramide — can trigger or worsen symptoms.
- Can iron deficiency cause restless legs?
- Yes — low ferritin strongly linked even when haemoglobin is normal. Iron supplementation may resolve RLS if ferritin is low — check levels before supplementing. See iron deficiency guide if anaemic.
- How is restless legs syndrome treated?
- Treat secondary causes; improve sleep hygiene; reduce caffeine and alcohol; moderate exercise. If ferritin low — iron replacement. Medicines — pramipexole, ropinirole (dopamine agonists), gabapentin/pregabalin, low-dose opioids in refractory cases — specialist initiation. Avoid dopamine agonists without monitoring — augmentation risk long term.
- Does magnesium help restless legs?
- Evidence is weak unless genuinely deficient. Worth correcting proven deficiencies (iron more important). Unregulated high-dose supplements carry risks — test first.
- Is restless legs syndrome serious?
- Not life-threatening but significantly affects sleep and quality of life — linked to insomnia, depression, and cardiovascular risk through sleep deprivation. Treating RLS improves sleep and daytime function.