Restless Legs Syndrome (RLS) – Symptoms & Treatment

What is Restless Legs Syndrome?

Restless legs syndrome (RLS), also known as Willis-Ekbom disease, is a neurological condition characterized by an irresistible urge to move the legs – and occasionally the arms – accompanied by unpleasant sensations. Symptoms typically occur during periods of inactivity and worsen in the evening and at night, while movement provides temporary relief. RLS is one of the most common neurological disorders, affecting an estimated 5–10% of the general population.

Causes

RLS is classified into two main types:

Primary (Idiopathic) RLS

In the more common primary form, no underlying condition can be identified as the cause. A genetic predisposition is suspected, as the condition often runs in families. Disruptions in the dopamine system of the brain are believed to play a key role.

Secondary RLS

Secondary RLS occurs as a consequence of another medical condition or deficiency. Common causes include:

• Iron deficiency and iron deficiency anemia
• Chronic kidney disease (renal insufficiency)
• Pregnancy (especially in the third trimester)
• Peripheral neuropathy (nerve damage)
• Certain medications (e.g., antidepressants, antipsychotics, antihistamines)
• Deficiencies in folate or magnesium

Symptoms

The sensations associated with RLS are often difficult to describe. Typical symptoms include:

• Unpleasant feelings in the legs such as tingling, pulling, burning, itching, or an inner restlessness
• An overwhelming urge to move the legs
• Worsening of symptoms during rest or inactivity (e.g., when lying down or sitting)
• Partial or complete relief of symptoms through movement, stretching, or walking
• Symptoms that begin or intensify in the evening or at night
• Significant sleep disturbances leading to daytime fatigue
• Many individuals also experience periodic limb movements in sleep (PLMS), which are involuntary leg jerks during sleep

Diagnosis

The diagnosis of RLS is primarily clinical, meaning it is based on the description of symptoms rather than a specific laboratory test or imaging study. The International Restless Legs Syndrome Study Group (IRLSSG) has established four essential diagnostic criteria:

• An urge to move the legs, usually accompanied by uncomfortable sensations
• Symptoms begin or worsen during periods of rest or inactivity
• Symptoms are partially or completely relieved by movement
• Symptoms are worse in the evening or at night

Blood tests (e.g., ferritin levels, complete blood count, kidney function) are performed to rule out secondary causes. A sleep study (polysomnography) may be recommended if significant sleep disturbances are present.

Treatment

Non-Pharmacological Measures

For mild symptoms, lifestyle changes and non-drug approaches may provide sufficient relief:

• Regular, moderate physical exercise
• Maintaining consistent sleep schedules and good sleep hygiene
• Reducing or avoiding caffeine, alcohol, and nicotine
• Applying heat or cold packs to the legs
• Relaxation techniques and stress management

Treating Underlying Conditions

When secondary RLS is identified, addressing the root cause is the primary goal. For example, iron supplementation in cases of confirmed iron deficiency can lead to a significant improvement in symptoms.

Pharmacological Treatment

For moderate to severe symptoms, the following medication classes are used:

• Dopamine agonists (e.g., pramipexole, ropinirole, rotigotine) – considered first-line therapy; they mimic the action of dopamine in the brain
• Alpha-2-delta ligands (e.g., gabapentin, pregabalin) – particularly effective when RLS is accompanied by pain or sleep disorders
• Opioids (e.g., oxycodone/naloxone) – reserved for severe, treatment-resistant cases
• Oral or intravenous iron supplementation to address iron deficiency

Long-term use of dopamine agonists can sometimes lead to a phenomenon known as augmentation – a paradoxical worsening of symptoms caused by the treatment itself. In such cases, a change in therapy strategy is necessary.

Prognosis

Primary RLS is generally a chronic condition, but it is highly manageable with appropriate treatment. Most individuals experience significant improvements in quality of life and sleep with proper therapy. Secondary RLS may resolve entirely once the underlying cause has been successfully treated.

References

1. Allen RP et al. – Restless legs syndrome/Willis-Ekbom disease diagnostic criteria: updated International Restless Legs Syndrome Study Group (IRLSSG) consensus criteria. Sleep Medicine, 2014; 15(8): 860-873.
2. Trenkwalder C, Paulus W – Restless legs syndrome: pathophysiology, clinical presentation and management. Nature Reviews Neurology, 2010; 6(6): 337-346.
3. National Institute of Neurological Disorders and Stroke (NINDS) – Restless Legs Syndrome Fact Sheet. National Institutes of Health (NIH), 2023. Available at: www.ninds.nih.gov