Restless legs syndrome !

A strong urge to move the legs with unpleasant sensations, worse at rest and in the evening, eased by moving. It often disrupts sleep.

Updated 2026-11-01

Structures involved

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Why it happens

What it is

A common sensorimotor sleep disorder (also called Willis-Ekbom disease) defined by an urge to move the legs, usually with uncomfortable sensations, that starts or worsens at rest, is relieved by movement and is worse in the evening or night. It can be primary or secondary to other conditions, and it is a frequent cause of insomnia.

Who gets it

Affects roughly 5-10% of adults in European and American populations, with clinically significant forms in about 2-3%; it is about twice as common in women and increases with age. Studies in Latin America report similar figures. It is especially frequent in pregnancy (third trimester), in people on haemodialysis and in iron deficiency, all common in Colombia.

Causes

Primary (idiopathic): often familial, with earlier onset and several susceptibility genes
Low brain iron, even with normal blood haemoglobin
Secondary: iron deficiency, chronic kidney disease on dialysis, pregnancy, peripheral neuropathy
Drugs that worsen it: dopamine antagonists (antipsychotics, some antiemetics), sedating antihistamines, many antidepressants
Caffeine, alcohol, nicotine and sleep deprivation aggravate symptoms

Risk factors

Family history
Female sex and pregnancy
Iron deficiency (low ferritin)
Chronic kidney disease, especially on dialysis
Diabetes and peripheral neuropathy
Parkinson disease

Pathophysiology

Reduced iron in brain regions such as the substantia nigra disturbs dopamine signalling in pathways from the brainstem and diencephalon to the spinal cord. Dopamine activity normally falls in the evening, which explains the circadian pattern. Spinal sensory and motor circuits become more excitable, producing the urge to move and the periodic leg movements during sleep. The good response to dopaminergic drugs and iron supports this model; there is no neurodegeneration as in Parkinson disease.

Classification

Primary (idiopathic) versus secondary restless legs syndrome
Early onset (before about 45 years, often familial, slow progression) versus late onset (often secondary, faster)
By frequency: intermittent or chronic persistent

Symptoms and signs

An urge to move the legs, often with creeping, crawling, pulling or burning sensations deep in the legs
Symptoms start or worsen when sitting or lying down
Relief, at least partial, while walking or stretching
Worse in the evening and at night
Difficulty falling or staying asleep and daytime tiredness
Periodic limb movements during sleep (jerks noticed by the bed partner)

Diagnosis

Clinical: Clinical diagnosis using the four essential features (urge to move, worse at rest, relieved by movement, worse at night) when the symptoms are not explained by another condition such as cramps, positional discomfort, arthritis or venous disease. Ask about family history, medicines, caffeine, pregnancy and kidney disease.
Tests: Serum ferritin and iron studies in every patient (iron therapy is considered when ferritin is below about 75 ng/mL), complete blood count, kidney function and glucose. Polysomnography is not routinely needed but shows periodic limb movements of sleep.
Imaging: Not required; imaging is used only if another neurological disorder is suspected.

Differential diagnosis

Nocturnal leg cramps
Peripheral neuropathy and radiculopathy
Akathisia from antipsychotics
Venous insufficiency or peripheral artery disease
Positional discomfort and arthritis
Attention deficit hyperactivity disorder or "growing pains" in children

Goal of treatment

Reduce symptoms enough to restore sleep and quality of life by correcting iron deficiency and other causes, removing aggravating drugs and using the safest effective medicine, while avoiding augmentation.

Treatment

Lifestyle: Regular sleep schedule, moderate daytime exercise, leg massage or warm baths, and reducing caffeine, alcohol and nicotine.
Medical: Iron replacement (oral or intravenous) when ferritin is low; treat underlying kidney disease or neuropathy and stop or change aggravating drugs where possible.
Medical: Alpha-2-delta ligands (gabapentin enacarbil, pregabalin, gabapentin) are now preferred first-line drugs for chronic symptoms; dopamine agonists (pramipexole, ropinirole, rotigotine) work well but carry a risk of augmentation; low-dose opioids are reserved for severe refractory cases.
Follow-up: Follow-up of symptom severity and timing to detect augmentation, ferritin levels, sleep, mood and adverse effects such as impulse-control disorders with dopamine agonists.

Drugs for this condition

Complications

Chronic insomnia and daytime sleepiness
Depression and anxiety
Augmentation from dopaminergic drugs
Impulse-control disorders with dopamine agonists
Reduced quality of life and work performance

Prognosis

Primary restless legs syndrome is usually lifelong and slowly progressive, but well controlled in most patients. Secondary forms often improve or disappear when the cause is corrected, for example after delivery, iron repletion or kidney transplantation.

Test yourself

Think of the answer, then tap the question to see it.

What are the four essential features of restless legs syndrome?

Urge to move the legs, worse at rest, relieved by movement, and worse in the evening or night.

Which laboratory test should be checked in every patient?

Serum ferritin (with iron studies); iron is replaced when stores are low.

What are three common secondary causes?

Iron deficiency, chronic kidney disease on dialysis and pregnancy (also peripheral neuropathy).

What is augmentation?

A treatment-related worsening with dopaminergic drugs: symptoms become more intense, start earlier in the day or spread to other body parts.

Which drug classes can make restless legs worse?

Dopamine antagonists (antipsychotics, metoclopramide), sedating antihistamines and many antidepressants.

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Educational information, not medical advice. For any symptom, see a health professional.

Sources: Restless Legs | RLS | MedlinePlus (MedlinePlus (U.S. National Library of Medicine), 2026); Restless Legs Syndrome | National Institute of Neurological Disorders and Stroke (National Institute of Neurological Disorders and Stroke (NINDS), 2026).

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Representative model, for educational purposes only.

Substantia nigra highlighted on the Durgical 3D model