Restless leg syndrome often worsens over time, and the cause is usually identifiable. The most common reasons include medication side effects (sometimes from the very drugs prescribed to treat RLS), new nutritional deficiencies, lifestyle triggers, and underlying health conditions that have changed. Understanding which factor is driving your symptoms can make the difference between years of escalating discomfort and getting back to manageable nights.
Your RLS Medication May Be the Problem
The most important and least intuitive reason RLS gets worse is a phenomenon called augmentation. If you take a dopamine-based medication for RLS, the treatment itself can eventually cause your symptoms to intensify, start earlier in the day, and spread to parts of your body that were never affected before, like your arms. This isn’t a sign that the underlying disease is progressing. It’s a reaction to the medication.
Augmentation is remarkably common. The annual incidence rate is around 8% for the two most widely prescribed dopamine agonists, pramipexole and ropinirole. Over ten years of use, roughly half of patients experience it. That’s a coin flip. The pattern is predictable: the medication works well at first, then symptoms creep back, so the dose goes up, which provides temporary relief before the cycle repeats. If your RLS was well controlled for months or years and has recently started breaking through, augmentation is the leading suspect.
This problem has become so well recognized that treatment guidelines shifted significantly in 2024. The American Academy of Sleep Medicine now conditionally recommends dopamine agonists rather than endorsing them as first-line therapy. Gabapentinoids (a class of nerve-calming medications) have taken over as the preferred starting treatment because they provide sustained symptom relief without the augmentation risk. If you’re on pramipexole, ropinirole, or rotigotine and your symptoms are worsening, talk to your prescriber about whether augmentation is occurring and whether switching medication classes makes sense.
Other Medications That Quietly Make RLS Worse
Several common medications can worsen RLS even though they were prescribed for something completely unrelated. Antidepressants are a well-known trigger, with mirtazapine being one of the worst offenders. If your RLS worsened around the same time you started or increased an antidepressant, the timing is likely not coincidental.
Over-the-counter sleep aids are another frequent culprit, and this one stings because people often reach for them precisely because RLS is keeping them awake. Most OTC sleep medications contain antihistamines (diphenhydramine or doxylamine), and these can make restless legs noticeably worse. Melatonin supplements may also aggravate symptoms. If you’ve been self-treating your sleep problems with anything from the pharmacy shelf, that could be fueling the cycle.
Iron and Vitamin Deficiencies
Low iron is the single most established nutritional driver of RLS. Your brain needs iron to produce dopamine properly, and when iron stores drop, even if they’re still technically in the “normal” range on a standard blood test, RLS symptoms can flare. The threshold that matters for RLS is your ferritin level, a measure of stored iron. Many RLS specialists consider levels below 75 adequate for most purposes but insufficient for someone with restless legs.
Vitamin B12 deficiency has a similar relationship. Patients with RLS tend to have lower B12 levels, and the severity of their symptoms correlates with how low those levels are. The connection makes biological sense: B12 is involved in the chemical reactions your body uses to produce dopamine. When B12 is deficient, those reactions slow down. B12 supplementation has also been shown to reduce the inflammatory markers that are elevated in severe RLS. Folate deficiency, which often travels alongside low B12, has been linked to RLS as well, particularly in pregnant women.
If your diet has changed, you’ve developed digestive issues that affect absorption, or you’ve started a medication that depletes these nutrients, your worsening symptoms may trace back to something a blood test can identify.
Caffeine, Alcohol, and the Sleep Deprivation Loop
Caffeine is a direct RLS trigger. It doesn’t just make it harder to fall asleep; it can provoke or intensify the crawling, pulling sensations themselves. In clinical case reports, heavy coffee drinkers have seen their symptoms resolve entirely after cutting out caffeine. One documented case involved a woman drinking 10 to 12 cups a day who experienced significant relief simply by stopping. You don’t need to be drinking that much for caffeine to matter. Even moderate intake, especially in the afternoon or evening, can lower your threshold for symptoms that night.
Alcohol and nicotine also worsen RLS. Alcohol may feel like it helps you relax in the moment, but it disrupts the deeper stages of sleep where your body gets its most restorative rest, and it can intensify leg sensations later in the night as it’s metabolized.
Then there’s the feedback loop. Poor sleep from RLS lowers your body’s ability to regulate symptoms the following night, which produces worse sleep, which produces worse symptoms. If you’ve noticed your RLS spiraling over weeks or months without any obvious new trigger, this self-reinforcing cycle may be the mechanism. Anything that improves your overall sleep quality, even if it doesn’t target RLS directly, can help break the pattern.
Health Conditions That Worsen RLS Over Time
Several chronic conditions are linked to RLS severity, and if one of these has developed or progressed, it could explain why your symptoms are escalating.
Kidney disease is one of the strongest associations. As kidney function declines, the body accumulates waste products that interfere with dopamine signaling, and kidney disease often causes iron deficiency and anemia at the same time. Patients on dialysis have particularly high rates of severe RLS. If you have known kidney problems or risk factors like diabetes or high blood pressure, worsening RLS may be a signal to check your kidney function.
Diabetes can contribute through a different pathway: nerve damage. Peripheral neuropathy, the tingling and numbness that develops in the feet and legs when high blood sugar damages small nerves, frequently overlaps with RLS. When both conditions are present, symptoms become more intense and painful than either condition alone. If your RLS has taken on a more burning or painful quality, neuropathy may be layering on top of it.
Pregnancy and Hormonal Changes
If you’re pregnant and your RLS has become unbearable, you’re in large company. Up to a third of pregnant women experience RLS, compared to about 5% of the general population. Among those affected, half report moderate to severe symptoms, meaning the sensations show up more than four times a week. Symptoms typically peak in the third trimester.
The exact hormonal mechanisms aren’t fully understood, but the practical factors are clear: pregnancy dramatically increases your body’s demand for iron and folate, both of which are directly tied to RLS severity. The reassuring news is that pregnancy-related RLS usually resolves after delivery, though it can take several weeks.
How to Identify Your Specific Trigger
The most useful thing you can do is work backward from when your symptoms changed. Consider what else shifted around the same time: a new medication, a dietary change, a new health diagnosis, increased stress, or a creeping increase in caffeine or alcohol. If you’ve been on a dopamine agonist for RLS for more than a year and your symptoms now start earlier in the day or affect your arms, augmentation is the most likely explanation.
A blood panel checking ferritin, B12, folate, kidney function, and blood sugar can rule in or rule out the most common secondary causes. Ferritin is particularly worth requesting specifically, since a standard complete blood count won’t capture it. Many people find that their worsening RLS traces back to a single correctable factor, whether that’s a medication switch, a nutritional deficiency, or a lifestyle habit that crept up gradually enough to escape notice.