Restless leg syndrome (RLS) is a neurological condition that causes an uncomfortable, often irresistible urge to move your legs, typically when you’re sitting still or lying down. It affects roughly 7% of adults worldwide, making it one of the most common movement disorders. Despite how prevalent it is, RLS is frequently misunderstood or dismissed, even though it can seriously disrupt sleep and quality of life.
What It Feels Like
The hallmark of RLS is an unpleasant sensation deep in the legs that creates a powerful need to move them. People describe it differently: crawling, tingling, pulling, throbbing, or an electric buzzing feeling. It’s not the same as a muscle cramp or numbness. The sensation sits somewhere between discomfort and pain, and the only thing that reliably eases it is getting up and moving around.
Symptoms follow a distinct pattern. They appear or worsen during periods of rest, particularly in the evening and at night. This timing isn’t random. It reflects a circadian rhythm in the brain chemistry driving the condition. Many people with RLS find that their worst symptoms hit right at bedtime, making it difficult to fall asleep. The result is chronic sleep deprivation, daytime fatigue, and difficulty concentrating.
Who Gets It
A 2024 analysis in the Journal of Global Health estimated the global prevalence at 7.12% among adults aged 20 to 79. Women are more affected than men, with prevalence rates of about 8.3% versus 6% respectively. The condition becomes more common with age, climbing from around 5.5% in your early twenties to roughly 8.7% by your late sixties, where it plateaus.
RLS runs in families. Genome-wide studies have identified 19 genetic risk regions linked to the condition. The strongest genetic risk factor is a gene called MEIS1, which nearly doubles your odds of developing RLS. Other identified genes play roles in nerve development, including how nerve cells form connections and guide signals through the spinal cord. If one of your parents has RLS, your chances of developing it are significantly higher, and symptoms in familial cases tend to start earlier in life.
What Causes It in the Brain
Two intertwined problems drive RLS: low iron levels in the brain and disrupted dopamine signaling. These aren’t separate issues. Iron is a necessary ingredient for producing dopamine, so when brain iron drops, dopamine production and regulation go haywire.
The leading theory points to a small cluster of nerve cells in the brain called the A11 cell group, located in a region of the hypothalamus. This cell group is the only source of dopamine for the spinal cord. When it underperforms, the spinal cord’s sensory and motor circuits become overexcitable, producing the creeping sensations and involuntary urge to move that define RLS. Animal studies support this: mice lacking certain dopamine receptors show exaggerated spinal reflexes and reversed circadian patterns in dopamine-producing enzymes, mirroring the nighttime worsening seen in humans.
Brain iron deficiency compounds the problem. Iron is required at the rate-limiting step of dopamine production, meaning even a modest shortage can bottleneck the entire system. Studies in iron-deprived animals show reduced dopamine receptors and abnormal dopamine levels in key brain areas.
Secondary Causes and Triggers
Not all RLS is genetic. “Secondary” RLS develops as a consequence of another medical condition, and treating that condition can resolve the symptoms entirely.
- Kidney disease: RLS affects anywhere from 6.6% to 62% of people on long-term dialysis and carries a higher mortality risk in this group. Symptoms typically disappear within weeks of a successful kidney transplant.
- Pregnancy: RLS commonly appears in the third trimester, likely driven by iron depletion and hormonal shifts, and usually resolves after delivery.
- Iron deficiency: Even when your standard blood tests look normal, your iron stores may be too low to support adequate dopamine production in the brain.
Certain medications can trigger or worsen RLS. A large study of over 63,000 people, published through the National Heart, Lung, and Blood Institute, found that acid-blocking medications (proton pump inhibitors and H2 blockers) were strongly linked to higher rates of RLS. People who regularly took two or more of these drugs were about twice as likely to have the condition. These drugs likely interfere with iron absorption, which connects back to the core iron-dopamine mechanism. Antihistamines used for allergies and many common antidepressants are also known to aggravate symptoms.
How Iron Levels Guide Treatment
The first step in managing RLS is checking your iron status with a blood test. The key number is your serum ferritin level, which reflects how much iron your body has in storage. For most people, a ferritin level above 20 or 30 is considered “normal,” but that threshold is too low for RLS.
RLS specialists recommend iron supplementation for anyone with a ferritin level at or below 75 ng/mL. The typical approach is an oral iron supplement (65 mg of elemental iron) taken with vitamin C on an empty stomach every one or two days. The every-other-day schedule may sound counterintuitive, but research shows the body absorbs iron more efficiently this way. You should expect to take oral iron for at least three months before judging whether it’s working.
Intravenous iron is an option when oral supplements aren’t tolerated, aren’t absorbed well (common after bariatric surgery or with gastrointestinal conditions), or when a faster response is needed. For some people, correcting iron deficiency alone is enough to eliminate symptoms.
Medications for RLS
Four prescription medications are currently approved specifically for RLS. They fall into two categories.
The first category targets dopamine receptors directly. Three drugs fit here: pramipexole (a pill), ropinirole (a pill), and rotigotine (a skin patch). These work by stimulating dopamine activity in the brain and spinal cord, compensating for the underperformance of the A11 cell group. They’re effective, but they carry an important long-term risk called augmentation, where symptoms gradually start appearing earlier in the day, spread to other parts of the body, or become more intense. Augmentation is the most significant complication of dopamine-based treatment, and it requires close monitoring. Because of this risk, doctors increasingly reserve these medications for more severe cases or use them at the lowest possible dose.
The second category works on different brain circuits. Gabapentin enacarbil is the one approved option here. It’s typically taken once daily in the late afternoon so it reaches effective levels by bedtime. It doesn’t carry the same augmentation risk as dopamine-targeting drugs, which has made it an increasingly popular first choice.
Non-Drug Approaches That Help
Lifestyle changes won’t cure moderate or severe RLS on their own, but they can meaningfully reduce symptom burden. Regular moderate exercise, particularly earlier in the day, consistently shows benefit in studies. Vigorous exercise close to bedtime can backfire.
Pneumatic compression devices, which are inflatable sleeves that rhythmically squeeze the legs, have shown genuine effectiveness. In a controlled trial published in CHEST Journal, people who used these devices for at least an hour daily before their usual symptom onset saw significant improvements in symptom severity, quality of life, daytime sleepiness, and fatigue after one month, compared to those using a sham device.
Caffeine and alcohol both tend to worsen symptoms, and reducing or eliminating them is a low-cost first move worth trying. Keeping a consistent sleep schedule also helps, since sleep deprivation itself lowers the threshold for RLS symptoms, creating a vicious cycle. Some people find relief with leg massage, warm baths, or stretching before bed, though evidence for these is more anecdotal than clinical. If you’re taking any acid-blocking medication, antihistamine, or antidepressant and notice your symptoms worsening, that’s worth discussing with your doctor as a potential contributing factor.