What RLS feels like
A creeping, crawling, or aching urge to move the legs that worsens in the evening and improves with movement. For some patients it is mild and intermittent; for others it dominates sleep and quality of life. The condition is well-defined, underdiagnosed, and treatable.
Diagnostic criteria (the four pillars)
- An urge to move the legs, usually with 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
Common contributors
- Iron deficiency — even when hemoglobin is normal, low ferritin can drive RLS
- Pregnancy — particularly the third trimester; usually resolves postpartum
- Chronic kidney disease — RLS is markedly more prevalent in dialysis patients
- Certain medications — some antihistamines, antidepressants, and antinausea drugs
- Family history — primary RLS often has a genetic basis
- Peripheral neuropathy — sometimes mimics or coexists
How we evaluate
- Sleep medicine consultation with structured RLS criteria review
- Complete iron studies — ferritin, transferrin saturation, total iron-binding capacity
- Kidney function and basic metabolic panel
- Polysomnogram when periodic limb movement during sleep (PLMS) is suspected
- Neurological examination when peripheral neuropathy is suspected
Treatment
- Iron repletion — oral or IV iron when ferritin is low, often dramatically effective
- Lifestyle adjustments — caffeine and alcohol timing, evening exercise patterns
- Medication review — identifying and adjusting RLS-aggravating drugs
- Pharmacologic therapy — dopaminergic agents, alpha-2-delta ligands, or low-dose opioids in refractory cases
- Treatment of coexisting sleep apnea — apnea and RLS frequently coexist; treating one improves the other
What to expect
For iron-deficient patients, repletion often produces noticeable improvement within four to eight weeks. For other patients, the initial pharmacologic plan typically achieves meaningful benefit within two to four weeks. We monitor for augmentation — a known phenomenon where dopaminergic medication paradoxically worsens RLS over time — and adjust accordingly.
Restless legs is one of the most rewarding sleep conditions to treat. The diagnosis is straightforward, and the right treatment frequently changes a patient's nights within weeks. — Dr. Han Jin-Kyu