When Your Legs Will Not Let You Rest
An irresistible urge to move your legs. A crawling, tingling, pulling sensation deep inside that intensifies when you sit or lie down. Relief that comes only with movement – but returns the moment you stop. Restless Legs Syndrome (RLS) is a neurological condition that sounds minor but can be profoundly disabling, destroying sleep quality and making simple activities like sitting in a meeting or watching a film nearly impossible.
At our practice in Zürich Seefeld, I take RLS seriously because it significantly impacts quality of life and because treatable underlying causes are frequently identified.
What Is Restless Legs Syndrome?
RLS is a sensorimotor disorder characterised by an uncomfortable sensation in the legs (and sometimes arms) accompanied by an overwhelming urge to move them. The key diagnostic features are: the urge to move, usually accompanied by uncomfortable sensations; symptoms begin or worsen during rest or inactivity; symptoms are partially or totally relieved by movement; symptoms are worse in the evening or at night.
What Causes RLS?
Iron deficiency: The most important and treatable cause. Brain iron is essential for dopamine function, and even when blood iron levels appear “normal,” brain iron may be insufficient. Ferritin below 75 ng/mL is associated with RLS – far higher than the standard laboratory “normal” cutoff.
Dopamine dysfunction: RLS is fundamentally a disorder of dopaminergic signalling in the brain, which is why iron (a cofactor for dopamine synthesis) is so critical.
Genetic predisposition: Over 60% of RLS patients have a family member with the condition. Several genetic variants affecting iron metabolism and dopamine pathways have been identified.
Magnesium deficiency: Magnesium is involved in neuromuscular function, and deficiency can worsen or trigger RLS symptoms.
Peripheral neuropathy: Nerve damage from diabetes, B12 deficiency, or other causes can trigger secondary RLS.
Kidney disease: RLS is very common in patients with chronic kidney disease, likely related to iron metabolism and uraemic toxins.
Medications: Antihistamines, antidepressants (SSRIs and SNRIs), antipsychotics, and some anti-nausea medications can trigger or worsen RLS.
Pregnancy: RLS affects up to 30% of pregnant women, usually in the third trimester, often related to iron and folate demands.
Our Diagnostic Approach
Diagnosis is clinical, based on the four criteria above. I then investigate for underlying causes: ferritin (aiming for above 75 ng/mL, not just “in range”), iron studies, vitamin B12, folate, magnesium, kidney function, blood sugar, and thyroid function. Medication review is essential. Nerve conduction studies may be indicated if peripheral neuropathy is suspected.
What We Do: Calming Restless Legs
Iron optimisation: If ferritin is below 75 ng/mL, iron supplementation (or intravenous iron for faster repletion) often dramatically improves symptoms. This is the single most important intervention.
Magnesium supplementation: Magnesium glycinate before bed can reduce symptoms and improve sleep quality.
Medication review: Identifying and, where possible, replacing medications that worsen RLS.
Lifestyle strategies: Regular moderate exercise (not too close to bedtime), leg stretching, warm baths, massage, and avoiding caffeine and alcohol in the evening.
Dopaminergic medication: When iron optimisation and lifestyle measures are insufficient, low-dose dopamine agonists or alpha-2-delta ligands (gabapentin/pregabalin) can provide significant relief. I prescribe these cautiously to avoid augmentation.
Address underlying conditions: Treating B12 deficiency, neuropathy, or kidney dysfunction when identified.
Conclusion
Restless Legs Syndrome is a real neurological condition with identifiable and often treatable causes. If RLS is disrupting your sleep and quality of life, a thorough evaluation – particularly of your iron status – may provide the answer. Book a consultation at our practice in Zürich Seefeld.
