- Hallmark
- Urge to move at rest, worse in the evening, relieved by movement
- Key measurable factor
- Iron stores (ferritin)
- Common triggers
- Sedating antihistamines, some antidepressants, alcohol, caffeine
- Diagnosis
- Based on symptoms; no single confirming test
What restless legs feel like
People describe the sensations as crawling, pulling, throbbing, itching or an electric fizz deep in the legs, rather than on the skin. The National Institute of Neurological Disorders and Stroke describes the core features: an irresistible urge to move, symptoms that begin or worsen during rest such as sitting or lying down, relief with movement, and a pattern that is worse in the evening and at night.
Because symptoms peak at bedtime, RLS often makes it hard to fall asleep or stay asleep, which leads to daytime exhaustion, poor concentration and low mood. Many people with RLS also have periodic limb movements, jerks or twitches of the legs during sleep that a partner may notice.
Common causes and triggers
In many people, especially when it runs in the family, RLS has no single identifiable cause. Factors that can trigger or worsen it include:
- Low iron, which is thought to affect dopamine signaling in the brain
- Heavy menstrual bleeding in perimenopause, a common source of iron loss
- Kidney disease, especially in people on dialysis
- Pregnancy, particularly the last trimester
- Sedating antihistamines, including many over-the-counter sleep aids
- Some antidepressants, anti-nausea drugs and antipsychotics
- Alcohol, caffeine and nicotine
- Peripheral neuropathy and sleep apnea
Is it linked to menopause?
RLS is more common in women and often starts or worsens in middle age. The connection to menopause is not fully understood, and hormones have not been shown to be a direct cause. What is clear is that heavy or prolonged bleeding during perimenopause can deplete iron stores, and poor sleep from night sweats can make nighttime symptoms harder to cope with. Checking iron is especially worthwhile for women in this stage.
Evening habits that may help
Many people find a short walk or gentle stretching in the evening reduces symptoms at bedtime. Keeping the mind engaged during long periods of sitting, such as with a puzzle or a book, can help in theaters or on flights. Try moving caffeine earlier in the day and skipping alcohol at night for two weeks to see whether symptoms change.
Conditions that can look similar
Some leg symptoms are not RLS. Peripheral neuropathy causes numbness, tingling or burning that is often present during the day and does not reliably improve with movement. Poor circulation in the leg arteries causes calf pain while walking that eases with rest, the opposite of RLS. Leg cramps are sudden, painful muscle tightening rather than an urge to move.
When to see a doctor urgently
Get prompt care for:
- Pain, swelling, warmth or redness in one leg, which could be a blood clot: seek same-day care
- Leg symptoms with chest pain, shortness of breath, coughing blood or fainting: call 911
- New numbness, weakness, foot drop or a leg giving way
- Calf pain when walking that stops with rest, especially with a cold, pale foot or a sore that will not heal
- Symptoms that spread to the arms or are disrupting your daytime life
What testing can help
There is no scan or blood test that confirms RLS; the diagnosis rests on the pattern of symptoms and an exam. Blood tests are used to find treatable contributors. Iron studies come first: ferritin, serum iron and transferrin saturation. A complete blood count, kidney function, glucose or A1c and thyroid function are also reasonable, and vitamin B12 if there is numbness or tingling.
A sleep study is needed only if periodic limb movements or sleep apnea are suspected. A two-week log noting when symptoms start, what relieves them, and every evening medication, including over-the-counter sleep aids, is very helpful.
Treatment options in general terms
Treatment begins with addressing aggravating factors: correcting low iron under a clinician's guidance, reviewing medications with the prescriber (do not stop a prescription on your own), and cutting back on alcohol, caffeine and nicotine. Regular moderate exercise, a consistent sleep schedule, leg massage, warm baths and stretching help many people.
When symptoms remain troublesome, prescription options include gabapentin enacarbil or pregabalin, and in some cases other medicines. Dopamine-acting drugs can help but may worsen symptoms over time with long-term use, a problem called augmentation. An FDA-cleared device that stimulates nerves in the lower legs is another option.
How HealifyMD can help
A HealifyMD clinician can order iron studies and related labs, review your medications for common triggers, and help with perimenopause issues such as heavy bleeding that may be depleting iron. HealifyMD does not diagnose or manage RLS as a specialty, so persistent or severe symptoms and any red flags are referred to primary care, neurology or a sleep specialist.
Common questions
What causes restless legs at night?
Often no single cause is found, but low iron, kidney disease, certain medications, alcohol, caffeine and nicotine are common triggers.
Is restless legs syndrome caused by iron deficiency?
Low iron is one of the most important measurable contributors. Ferritin is usually checked first.
Are restless legs linked to menopause?
RLS often starts in midlife and is more common in women, and heavy perimenopausal bleeding can lower iron, but hormones have not been shown to be a direct cause.
Can my sleep aid make restless legs worse?
Yes. Many over-the-counter sleep aids contain sedating antihistamines, which can worsen RLS.
Should I take iron for restless legs?
Only after testing and with a clinician's guidance, because too much iron can be harmful and some people have iron overload conditions.
How do restless legs affect sleep?
They make it hard to fall asleep and stay asleep, which often leads to daytime fatigue and poor concentration.
When are restless legs a sign of something serious?
When one leg is swollen, red or warm, or when there is new numbness or weakness. These need prompt evaluation.
Sources
We cite government agencies, professional societies and peer-reviewed research. See our editorial policy.
- Restless legs syndromeNational Institute of Neurological Disorders and Stroke
- Restless legsMedlinePlus (U.S. National Library of Medicine)
- Iron-deficiency anemiaNational Heart, Lung, and Blood Institute
- Iron – fact sheet for consumersNIH Office of Dietary Supplements
- Numbness and tinglingMedlinePlus (U.S. National Library of Medicine)