Last updated:
You finally sit down for the evening, and your legs start to crawl, ache or buzz until you have to get up and move. That relentless urge is the hallmark of restless legs syndrome (RLS), a neurological sleep disorder that can quietly wreck your nights. The good news: treatment guidance has changed a lot in recent years, and iron now sits near the center of it.
- RLS causes an irresistible urge to move the legs, usually at rest and in the evening, with relief from movement.
- Up to 13% of adults have RLS, and women are nearly twice as likely as men to develop it.
- Low brain iron is a key driver; 2024 guidelines suggest iron treatment for adults with ferritin of 75 ng/mL or less or transferrin saturation under 20%.
- Dopamine agonists, long a common choice, are no longer recommended for standard use because of a worsening effect called augmentation.
What restless legs syndrome feels like
People describe RLS sensations as aching, throbbing, pulling, itching, crawling or creeping, according to the National Institute of Neurological Disorders and Stroke (NINDS). Mayo Clinic adds “electric” to the list. Four features define the condition:
- A strong urge to move the legs, often with uncomfortable sensations.
- Symptoms that start or worsen when you are resting, sitting or lying down.
- Relief, at least partly, with movement such as walking or stretching.
- Symptoms that are worse in the evening or at night.
Many people also have leg twitches during sleep. The result is trouble falling asleep, broken sleep, daytime exhaustion and difficulty concentrating. NINDS notes RLS can contribute to mood changes and depression.
The American Academy of Sleep Medicine (AASM) estimates that about 2% of children and up to 13% of adults have RLS.
What causes restless legs syndrome?
The exact cause often isn’t known, but researchers point to problems with dopamine signaling in the brain and low iron levels in the brain. Doctors often separate RLS into two broad types.
Primary (genetic) RLS
RLS often runs in families, and specific gene variants are linked to it. Mayo Clinic notes the family link is especially common when symptoms start before age 40.
Secondary RLS
Other conditions and substances can trigger or worsen symptoms. NINDS and Mayo Clinic list:
- Iron deficiency
- End-stage kidney disease and hemodialysis
- Peripheral neuropathy
- Pregnancy (symptoms usually fade after delivery)
- Sleep deprivation and sleep apnea
- Alcohol, nicotine and caffeine
- Certain medicines, including some anti-nausea drugs, antipsychotics, antidepressants that increase serotonin, and antihistamines
If you snore or stop breathing at night, it’s worth reading about the signs of sleep apnea, since the AASM notes that treating underlying conditions like sleep apnea may reduce RLS symptoms.
The iron and ferritin connection
Low iron can disrupt communication between brain cells and contribute to RLS symptoms, the AASM explains, and NINDS lists low brain iron among the condition’s likely drivers. Ferritin is a blood marker of your body’s iron stores, and the AASM notes doctors may order ferritin and iron tests as part of an RLS evaluation.
Here’s the key point: the guideline uses its own iron thresholds for RLS, so ask for your ferritin and transferrin saturation results, not just a general blood count. The 2024 AASM clinical practice guideline, summarized by Pharmacy Times, suggests considering iron treatment at these levels:
| Group | Iron levels at which treatment is suggested |
|---|---|
| Adults | Serum ferritin of 75 ng/mL or less, or transferrin saturation below 20% |
| Children | Serum ferritin below 50 ng/mL |
Iron can be given by mouth or by IV, and the guideline also recommends intravenous ferric carboxymaltose for patients with appropriate iron status. Your clinician will choose the route based on your levels and overall health.
Don’t start high-dose iron on your own. Too much iron can be harmful, and a blood test is the only way to know where you stand. If you’re curious how iron fits with other nutrients, our overview of vitamins and minerals people take daily covers the basics, but RLS iron therapy should be guided by a clinician.
Medical treatments for RLS
The AASM guideline, published in the Journal of Clinical Sleep Medicine in September 2024, reshaped RLS care. According to HCPLive, its strong recommendations are iron (oral or IV, when indicated) and a group of medicines called alpha-2-delta ligands: gabapentin, gabapentin enacarbil and pregabalin.
Why dopamine agonists fell out of favor
For years, drugs like pramipexole, ropinirole and rotigotine were common RLS treatments. They work well in the short term, but many people develop augmentation, where symptoms start earlier in the day, become more intense or spread to other body parts. A guideline author told HCPLive augmentation occurs at roughly 7% to 10% per year, adding up to 20% to 30% of people by three years. The guideline now suggests against their standard use.
If you already take one of these drugs and feel fine, don’t stop on your own. Talk with your doctor about whether a change makes sense.
Other options
- Dipyridamole: suggested for some adults.
- Opioids: such as extended-release oxycodone, reserved for severe cases that haven’t responded to other treatments.
- Nerve stimulation: the guideline suggests high-frequency bilateral peroneal nerve stimulation, a non-drug option. NINDS notes the FDA has approved tonic motor activation (TOMAC) devices for RLS.
Lifestyle steps that may ease symptoms
Self-care won’t cure moderate or severe RLS, but it can take the edge off. The AASM and NINDS suggest:
- Keeping a regular sleep schedule and avoiding sleep deprivation.
- Limiting caffeine, alcohol and nicotine.
- Getting regular exercise.
- Stretching, massage, a warm bath or a heating pad.
- Reviewing your medicine list with a pharmacist for drugs that may worsen RLS.
Stretching and exercise are both on the AASM’s list. Low-impact routines like wall Pilates for beginners can be an easy way to build gentle movement into your day.
How RLS is diagnosed
There’s no single test for RLS. A clinician will ask about your symptoms, medicines and family history and do a physical and neurological exam, according to NINDS. The AASM notes your doctor may ask you to keep a sleep diary for about two weeks. Blood tests may check ferritin and iron and help rule out kidney problems. The AASM says a formal sleep study isn’t required for diagnosis.
See a healthcare professional if leg sensations regularly keep you from falling or staying asleep, if you feel exhausted during the day, or if symptoms are spreading to other body parts or starting earlier in the day while on RLS medicine. Pregnant people, people with kidney disease and anyone taking antidepressants, antihistamines or antipsychotics should mention RLS symptoms to their clinician, since adjusting care may help.
Frequently asked questions
What ferritin level matters for restless legs?
The 2024 AASM guideline suggests iron treatment for adults with ferritin of 75 ng/mL or less or transferrin saturation below 20%. Your doctor can interpret your results alongside other blood tests.
Should I take iron supplements for RLS?
Only after a blood test and with medical guidance. Iron helps when stores are low, but too much iron can be harmful.
Is RLS during pregnancy permanent?
Usually not. NINDS notes pregnancy-related RLS typically resolves after delivery.
What is augmentation?
It’s a worsening of RLS linked to dopamine-based drugs, with symptoms starting earlier, becoming more intense or spreading. It’s the main reason guidelines moved away from these medicines.
Does exercise help restless legs?
Regular exercise is one of the lifestyle steps the AASM suggests, along with stretching, massage and warm baths. It works best alongside medical treatment for moderate or severe RLS.
Sources
- NINDS, Restless legs syndrome
- American Academy of Sleep Medicine, Restless legs syndrome
- Pharmacy Times, Updated clinical guideline recommendations for restless legs syndrome
- HCPLive, AASM updates clinical guidelines for restless legs syndrome
- Mayo Clinic, Restless legs syndrome: symptoms and causes
Save this guide for later on Pinterest
