Restless legs syndrome flares up in response to a surprisingly wide range of triggers, from common medications to everyday habits like sitting too long or drinking coffee in the evening. Understanding what makes your symptoms worse is one of the most practical things you can do to manage the condition, because many of these triggers are avoidable once you know what to look for.
Medications That Can Trigger Flares
Some of the most common RLS triggers are medications you might take without a second thought. Over-the-counter antihistamines, the kind found in many nighttime cold medicines and sleep aids, can worsen symptoms. So can melatonin supplements, which is especially frustrating since people with RLS often reach for sleep aids to cope with the very problem these products make worse.
Certain antidepressants are also well-known triggers. Mirtazapine is one of the worst offenders, but other antidepressants in the same broad category can provoke symptoms too. If you started or changed an antidepressant and noticed your legs getting worse at night, that connection is worth raising with your prescriber. Anti-nausea medications that block dopamine activity in the brain can also intensify RLS, since the condition is closely tied to how the brain uses dopamine.
Caffeine, Alcohol, and Nicotine
All three of these substances can make RLS worse, though they do it in different ways. Caffeine is a stimulant that keeps your nervous system alert, and consuming it too close to bedtime is a reliable way to trigger an episode. Alcohol disrupts your normal sleep cycle, and the fragmented sleep it produces creates conditions where RLS symptoms are more likely to surface. Nicotine acts as a stimulant as well and is best avoided if your symptoms are poorly controlled.
Cutting out evening caffeine is one of the simplest changes you can make. You don’t necessarily need to eliminate coffee entirely, but shifting your last cup earlier in the day can reduce the chances of a nighttime flare.
Sitting Still for Too Long
RLS symptoms typically begin after you’ve been lying down or sitting for an extended period. Long car rides, flights, and even sitting through a movie can set off that uncomfortable urge to move your legs. This is one of the defining features of the condition, and it’s why people with RLS often dread situations that require them to stay in one position.
If you know you’ll be sitting for a while, planning short movement breaks can help. On a flight, getting up to walk the aisle periodically may keep symptoms from building. In a theater or meeting, subtle leg stretches or shifting positions can provide some relief.
Low Iron Levels
Iron deficiency is one of the strongest known drivers of RLS severity, and it doesn’t take full-blown anemia to be a problem. The threshold that matters is lower than most people expect. The Restless Legs Syndrome Foundation recommends iron treatment when ferritin (the body’s primary iron storage marker) falls below 75 ng/mL, with the goal of raising it above 100 ng/mL. That means your iron levels could look “normal” on a standard blood test and still be low enough to worsen your RLS.
If you haven’t had your ferritin checked, it’s worth asking for. Oral iron supplements are the first-line approach when levels are low, and correcting an iron deficit can significantly reduce symptom severity in people whose RLS is driven by this deficiency.
Sleep Deprivation
This is one of the cruelest aspects of restless legs syndrome: poor sleep makes the condition worse, and the condition makes it harder to sleep. Sleep deprivation is a known trigger for more intense RLS episodes, creating a feedback loop that can escalate over time if nothing breaks the cycle. Prioritizing sleep hygiene, including reducing screen time before bed and keeping a consistent schedule, can help interrupt this pattern even before other treatments kick in.
Too Much or Too Little Exercise
Physical activity has a complicated relationship with RLS. Regular moderate exercise tends to reduce symptoms, but both extremes can make things worse. Long stretches of inactivity are a clear trigger. On the other end, unusually intense workouts or sudden bursts of vigorous exercise after a period of being sedentary can also provoke a flare.
The key is finding your personal threshold. Consistent, moderate activity like walking, swimming, or cycling tends to help. What you want to avoid is the pattern of doing nothing for days and then pushing hard in a single session. That kind of inconsistency is more likely to trigger symptoms than relieve them.
Chronic Kidney Disease
RLS is significantly more common in people with kidney problems. Up to 25% of patients on dialysis experience restless legs symptoms when assessed using standard diagnostic criteria. The relationship between kidney disease and RLS is complex, partly because kidney patients often have overlapping leg discomfort from nerve damage, cramping, and other issues that can make it hard to distinguish what’s actually RLS and what’s something else.
If you’re on dialysis or have chronic kidney disease and notice worsening leg restlessness, it’s worth discussing specifically as a potential RLS issue rather than assuming it’s just a general side effect of your condition.
Pregnancy
Pregnancy can trigger RLS for the first time or significantly worsen existing symptoms. A prospective study published in the journal Neurology found that symptoms tend to peak during the second trimester, with severity scores climbing from the first trimester and then easing somewhat in the third. Interestingly, this study found that iron deficiency, anemia, and estrogen levels did not clearly explain why some pregnant women developed RLS and others didn’t. Genetic factors and smoking history appeared to play a larger role.
The good news is that pregnancy-related RLS usually resolves after delivery. For women who already had the condition before becoming pregnant, symptoms typically return to their baseline level postpartum.
When Your Medication Starts Making It Worse
One of the more frustrating triggers is a phenomenon called augmentation, where the very medication prescribed for RLS gradually makes it worse. This happens most often with a class of drugs that work by mimicking dopamine in the brain. Over time, the medication can cause symptoms to start earlier in the day, become more severe at night, and spread to other parts of the body like the arms. Patients often find they need higher and higher doses to get the same relief, which only accelerates the problem.
Augmentation doesn’t mean the original diagnosis was wrong. It means the treatment approach needs to change. If your RLS medication worked well at first but now seems to be losing effectiveness, or your symptoms are showing up earlier in the day than they used to, that’s a pattern worth recognizing. Gradual medication modification under medical guidance, rather than simply increasing the dose, is the standard approach to managing augmentation.