What it is
Restless legs syndrome is a condition defined by an uncomfortable, often hard-to-describe urge to move the legs, usually accompanied by unpleasant sensations deep in the legs that people variously describe as crawling, tingling, pulling, aching or fizzing. Internationally agreed criteria describe five features: the urge worsens at rest, it is relieved at least partly by movement, it is worse in the evening and night, these first three are not solely accounted for by another condition, and the symptoms are not better explained by a mimic such as leg cramps or positional discomfort.
Although it is felt in the legs, it is a neurological condition, and it matters chiefly because of what it does to sleep. The symptoms peak just when a person is trying to settle and fall asleep, which makes it a common and under-recognised cause of insomnia and daytime tiredness.
What it can feel like
An evening that should be restful becomes a battle with one's own legs: a building discomfort that makes sitting still through a meal, a journey, a meeting or a film increasingly unbearable, eased only by getting up and walking, which brings relief that lasts only as long as the movement. At bedtime it is at its worst, so falling asleep can take hours, and the person may be up pacing while the household sleeps. Many people struggle for years to put the sensation into words and are not believed or are told it is nerves, which adds frustration to exhaustion.
How common is it
Restless legs syndrome is common, affecting a significant minority of adults to some degree, with a smaller proportion troubled severely enough to need treatment. It becomes more common with age and is more frequent in women, particularly during pregnancy. Despite being common, it is frequently undiagnosed, partly because the sensations are difficult to describe and easy to dismiss.
What causes it
In many people the cause is linked to how the body handles iron and the brain chemical dopamine, and there is often a family history. Critically, several causes are identifiable and treatable: low iron stores are one of the most important and most reversible; pregnancy commonly brings it on, often easing after birth; kidney disease is strongly associated; and some medicines, including certain antidepressants, antihistamines and anti-nausea drugs, can trigger or worsen it. Caffeine, alcohol and nicotine can aggravate symptoms. Finding a treatable cause can change the outcome entirely.
How it is diagnosed
Diagnosis is clinical, based on the characteristic urge-to-move pattern and its timing, and on excluding mimics such as cramps, poor circulation and nerve problems. A key and simple step is a blood test of iron stores, since low iron is a common, correctable driver. The clinician also reviews kidney function, pregnancy, and any medicines that might be responsible. Sleep studies are not usually needed unless another sleep disorder is suspected.
How it is treated
Treatment begins with the cause. If iron stores are low, correcting them, under medical guidance, often improves or resolves the symptoms, and this is one of the most rewarding steps in all of sleep medicine. Reviewing and where possible changing any aggravating medicines helps. Reducing caffeine, alcohol and nicotine, regular moderate exercise, and simple measures such as movement, stretching, warm baths or massage in the evening all contribute. Where symptoms remain troublesome despite these steps, specific prescription medicines can be very effective, prescribed and monitored by a doctor familiar with the condition, since they require careful management over time. In pregnancy, treatment focuses first on iron and non-drug measures under medical supervision.
Restless legs in the African context
Restless legs syndrome is little known here, and the strange urge to move the legs at night is easily dismissed as a habit, nerves, or imagination, so people suffer poor sleep for years without knowing it has a name and a treatment. One cause is especially important in our setting: iron deficiency, which is common, particularly in women and in pregnancy, and which can drive restless legs, so a simple blood test and treating low iron can resolve it. Kidney disease and some medicines can also be involved. Recognising the condition, and checking for iron deficiency, is often all it takes to bring real relief.
Managing it day to day
Alongside any treatment, these steps can ease symptoms.
- Ask a doctor to check your iron levels, since treating low iron resolves many cases.
- Cut back on caffeine, alcohol, and nicotine, especially in the evening, which can worsen symptoms.
- Keep regular sleep, and try gentle movement, stretching, or massage when symptoms strike.
- Review medicines with a doctor, since some can trigger or worsen it.
- Be patient in finding what helps you, and seek medical review if sleep is badly affected. Our insomnia guide may also help.
When to seek help
Seek help if an urge to move your legs, worse in the evening and at rest, is disrupting your sleep or daily life. Ask specifically for your iron stores to be checked, since correcting low iron is simple and often highly effective. Mention any kidney problems, pregnancy or medicines you take, as these guide treatment.
Sources
- American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.).
- Allen, R. P., et al. (2014). Restless legs syndrome/Willis-Ekbom disease diagnostic criteria: Updated International RLS Study Group consensus criteria. Sleep Medicine, 15(8), 860-873.
- Winkelmann, J., et al. (2018). Treatment of restless legs syndrome: Evidence-based review and implications for clinical practice (Revised 2017). Movement Disorders, 33(7), 1077-1091.
- Trenkwalder, C., Allen, R., Högl, B., et al. (2016). Restless legs syndrome associated with major diseases: A systematic review and new concept. Neurology, 86(14), 1336-1343.