Restless Legs Syndrome: Why It Happens and What Actually Helps

It is a difficult thing to describe to someone who has never had it. Not pain exactly, not quite an itch, more an unbearable restlessness deep in the legs that builds the longer you stay still and only lets go when you move. It arrives in the evening, ruins the transition into sleep, and sounds so odd out loud that many people never mention it to a doctor. It is a recognised neurological condition with a well-studied mechanism, and it is often treatable.

What restless legs syndrome actually is

Restless legs syndrome, also called Willis-Ekbom disease, is a sensorimotor disorder defined by an overwhelming urge to move the legs, usually with uncomfortable sensations that people describe as crawling, fizzing, pulling or electrical. Four features define it: the urge worsens at rest, it is relieved by movement, it is worse in the evening or at night, and it is not better explained by something else such as cramp or positional discomfort.

That evening pattern is the giveaway and it is not psychological. Symptoms follow a daily rhythm tied to the body clock, which is why sitting still at 10pm is unbearable while sitting still at 10am is fine. Many people also have periodic limb movements during sleep, repetitive leg jerks that fragment the night without waking them properly, which is why the daytime tiredness can be out of proportion to how long they were in bed.

The iron and dopamine story

The best-supported explanation involves iron in the brain rather than iron in the blood. Iron is required to make dopamine, and dopamine signalling in the pathways that control movement appears to be disrupted in restless legs. A 2026 review described the link between the condition and brain iron deficiency as well established, and it explains why symptoms respond to iron correction in many people even when they are not anaemic by standard measures.

Genetics matter too. Around half of people with restless legs have a family history, which points to inherited susceptibility, and symptoms often begin earlier in life in those cases. Several conditions raise the risk substantially: pregnancy, chronic kidney disease, particularly on dialysis, diabetes, and any state involving iron depletion. Some medications make it markedly worse, including many antihistamines, several antidepressants, antinausea drugs and antipsychotics. If symptoms appeared soon after a new prescription, that connection is worth investigating before anything else.

What to ask for, and the ferritin catch

The single most useful test is iron status, and it needs to be requested properly. Ferritin is the usual measure, and the target in restless legs is much higher than the threshold used to define anaemia, because the concern is brain iron rather than red blood cells. Someone can have perfectly normal blood counts and still benefit from iron correction.

There is an important catch. Ferritin rises with inflammation, infection and some illnesses, so a normal-looking ferritin can be misleading in those situations. Transferrin saturation is the more reliable measure when inflammation is in the picture, with a value under 20 percent suggesting genuine iron deficiency. Ask for both, and ask for the actual numbers rather than accepting that they were normal, since the thresholds that matter here are not the standard ones. Correcting reversible causes, low iron in particular, is the first step in current treatment algorithms rather than an afterthought.

What makes it worse

Several everyday things reliably aggravate symptoms, and removing them is a reasonable first move before considering medication.

• Alcohol in the evening, which worsens both symptoms and the sleep fragmentation around them.
• Caffeine, particularly later in the day.
• Nicotine.
• Sedating antihistamines, including many over-the-counter sleep aids, which are among the worst offenders.
• Sleep deprivation itself, which turns a manageable evening into a bad one.
• Prolonged immobility, such as long flights or evening screen sessions in one position.

The over-the-counter sleep aid problem deserves emphasis. People with restless legs frequently reach for antihistamine-based sleep tablets because they cannot sleep, and those tablets make the underlying condition considerably worse. It is one of the more common self-defeating loops in this condition.

What helps in practice

Start with the reversible: correct low iron under medical guidance, remove aggravating medications where possible, and cut evening alcohol and late caffeine. Regular moderate exercise helps, though intense exercise close to bedtime can backfire. Many people find relief in stretching, a warm bath, leg massage, or pneumatic compression devices, and some use counter-stimulation such as a cool or warm pack. A consistent sleep schedule genuinely helps, since sleep deprivation amplifies everything.

When symptoms remain disruptive, effective prescription options exist. Current guidance favours alpha-2-delta drugs such as gabapentin or pregabalin as first-line medication, with dopamine agonists used more cautiously than in the past. The reason for that shift matters: long-term dopamine agonist use can cause augmentation, where symptoms gradually become more severe, start earlier in the day and spread to other parts of the body. That is a real risk to discuss with a doctor before starting one, and it is the main reason prescribing practice has changed.

Magnesium deserves a brief, honest mention because it is the first thing most people try. The evidence that it helps restless legs specifically is weak, and it is often confused with ordinary night cramps, which are a different problem with a different feel. It is cheap and low risk, so trying it is reasonable, but if a few weeks bring nothing, that is your answer and the next step is getting iron status checked properly rather than working through the rest of the supplement shelf.

When to see a doctor

See a doctor if symptoms disturb your sleep more than a couple of nights a week, if they are worsening, or if they have started to appear earlier in the day. Ask specifically for ferritin and transferrin saturation, and ask for the numbers. Bring a list of your current medications, since removing a trigger sometimes resolves the whole problem.

Go sooner if symptoms began during pregnancy, if you have kidney disease or diabetes, or if you are already taking a dopamine agonist and find your symptoms creeping earlier into the day, which may indicate augmentation and needs review rather than a higher dose. This is general information, not medical advice. The thing worth knowing is that this is a recognised condition with real treatments, not a quirk to put up with in silence.

Frequently asked questions

What causes restless legs syndrome?

The best-supported explanation is low iron in the brain affecting dopamine signalling. Genetics play a large role, and pregnancy, kidney disease, diabetes and certain medications substantially raise the risk.

Does iron help restless legs?

Often, yes. Iron correction is a first-line step when iron status is low, and the target ferritin used in restless legs is higher than the threshold for anaemia, so normal blood counts do not rule it out.

What makes restless legs worse at night?

Symptoms follow a daily body-clock rhythm that peaks in the evening and night. Alcohol, caffeine, nicotine, sedating antihistamines and sleep deprivation all amplify them further.

Which medications make restless legs worse?

Sedating antihistamines, including many over-the-counter sleep aids, several antidepressants, antinausea drugs and antipsychotics are common aggravators. If symptoms began after a new prescription, raise it with your doctor.

Read next

• Insomnia: What Actually Helps, According to the Evidence

  When the problem is falling and staying asleep more broadly.

• Iron Deficiency: The Overlooked Cause of Constant Fatigue

  Why ferritin matters well before anaemia appears.

• Magnesium: Why Everyone Is Suddenly Talking About It

  A popular remedy for leg symptoms, examined honestly.

This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional about your individual situation, and never start or stop a medication without your doctor. See our Medical Disclaimer.