The most common reason you can’t stop moving your feet is restless legs syndrome (RLS), a neurological condition that creates an uncomfortable urge to move, especially in the evening and at night. But it’s not the only explanation. Anxiety, medication side effects, and nerve damage can all produce a similar restless sensation in your legs and feet. Understanding the pattern of your symptoms, particularly when they happen and what makes them better or worse, is the key to figuring out which cause fits.
Restless Legs Syndrome: The Most Likely Cause
RLS affects an estimated 5 to 10 percent of adults and produces a creeping, pulling, or aching sensation deep in the legs that only improves when you move. People describe it differently: some feel a buzzing or tingling, others an itch they can’t scratch, and some just feel an overwhelming need to shift, kick, or wiggle their feet. The sensation typically starts when you’ve been sitting or lying still for a while, which is why it tends to hit hardest at bedtime, during long flights, or while watching a movie.
Symptoms follow a distinct circadian pattern. They peak between roughly 11 p.m. and 4 a.m. and are at their mildest between 9 a.m. and 2 p.m. This cycle holds even when people are sleep-deprived, meaning it’s driven by your body’s internal clock rather than simply being tired. That evening-and-nighttime pattern is one of the clearest ways to distinguish RLS from other causes of restless feet.
What’s Happening in Your Brain
RLS is rooted in two connected problems: low iron levels in the brain and disrupted dopamine signaling. Iron and dopamine are tightly linked because the receptors that respond to dopamine (specifically a type called D2 receptors) depend on iron to function properly. When iron is low in certain brain regions, those receptors underperform, and the signals that normally keep your sensory and movement systems in balance start to misfire.
Here’s what makes it tricky: your blood iron levels can look perfectly normal on a standard test. Brain iron deficiency shows up in only about 25 to 44 percent of RLS patients through routine blood work. That’s why the International Restless Legs Syndrome Study Group recommends checking a specific marker called serum ferritin and considers supplementation when it falls below 75 mcg/L, a threshold well above what most labs flag as “low.”
The circadian pattern of symptoms ties back to dopamine’s natural daily rhythm. During the day, dopamine levels are higher and can compensate for weaker receptors. In the evening, dopamine production dips. If your D2 receptors are already underperforming because of low brain iron, that evening dip pushes dopamine signaling below a critical threshold. The result is the surge of uncomfortable sensations and the irresistible need to move your feet right when you’re trying to fall asleep.
Medications That Cause Restless Feet
If your symptoms started after beginning a new medication, the culprit may be a condition called akathisia. It produces an inner sense of restlessness and a compulsive need to move that can look and feel identical to RLS but has a completely different cause: the medication itself is disrupting your brain’s dopamine system.
The most common triggers are antipsychotic medications, especially older ones like haloperidol. But akathisia can also be caused by:
- Anti-nausea medications commonly given before chemotherapy or for severe nausea
- Calcium channel blockers used for blood pressure
- Anti-vertigo drugs
- Some antidepressants, though this is less common
- Sedatives used during anesthesia
The key difference between akathisia and RLS is timing. Akathisia doesn’t follow a circadian pattern. It can happen at any time of day and is usually tied clearly to when you started or increased a dose of medication. If you notice restless feet appearing within days or weeks of a medication change, that connection is worth raising with your prescriber.
Anxiety and Psychomotor Agitation
Anxiety can drive you to bounce your leg, tap your feet, or pace without realizing it. This is called psychomotor agitation, and it’s your nervous system’s way of discharging excess energy when you’re in a heightened state of stress or worry. Unlike RLS, anxiety-driven foot movement doesn’t usually come with uncomfortable physical sensations in the legs. It’s more of an unconscious habit, and you may not even notice you’re doing it until someone points it out.
One useful distinction: movements driven by anxiety tend to stop when you’re distracted or focused on something engaging. They can also be influenced by suggestion. If someone asks you to hold still and you can do it comfortably (even if your foot starts up again later), that points more toward a stress response than a neurological condition. RLS, by contrast, produces a physical discomfort that gets worse the longer you try to stay still.
Nerve Damage as a Contributing Factor
Small fiber neuropathy, a type of nerve damage that affects the tiny nerves in your skin and extremities, can overlap with or contribute to restless feet. This type of neuropathy produces burning, shooting pain, unusual skin sensations, and changes in how you perceive temperature, particularly in the feet and lower legs. Conditions that raise your risk include diabetes, prediabetes (impaired glucose metabolism), and autoimmune disorders.
Research on RLS patients has found signs of increased sympathetic nerve activity in the skin, essentially an overactivation of the “fight or flight” nerve fibers, along with evidence that tissues in the legs may not be getting enough oxygen. These findings suggest that for some people, the urge to move their feet isn’t purely a brain-level problem. Peripheral nerve dysfunction in the legs themselves may be amplifying or even triggering the sensation. If your restless feet come with burning pain, numbness, or a noticeable change in how hot and cold feel on your skin, neuropathy may be part of the picture.
Movements That Happen During Sleep
Some people move their feet involuntarily during sleep without being aware of it. This is called periodic limb movement disorder (PLMD), and it involves repetitive jerking or flexing of the feet and legs, typically every 20 to 40 seconds throughout the night. A bed partner might notice it before you do. The main clue is unexplained poor sleep: you get what should be enough hours but wake up feeling unrested.
RLS and PLMD frequently overlap, but they’re diagnosed differently. RLS is identified based on your description of symptoms while you’re awake. PLMD requires a sleep study to detect the involuntary movements happening while you’re asleep. Having one doesn’t automatically mean you have the other, though many people with RLS also show periodic limb movements on a sleep study.
What Actually Helps
If low iron is a factor, correcting it can significantly reduce symptoms. Ask for a serum ferritin test rather than just a basic iron panel. Many people with RLS have ferritin levels that are technically “normal” by standard lab ranges but still below the 75 mcg/L threshold where supplementation makes a meaningful difference.
For moderate to severe RLS, there are four FDA-approved medications. Three of them work by mimicking dopamine (ropinirole, pramipexole, and rotigotine, which is delivered through a skin patch). The fourth, gabapentin enacarbil, works on a different pathway and is taken once daily with food in the late afternoon. Your doctor’s choice between these depends on your specific symptoms, other medications you take, and how your body responds.
Non-drug approaches have real evidence behind them too. Compression stockings improved symptoms in clinical trials at a moderate level of evidence. Regular exercise also reduced symptoms, though the evidence is less robust. The combination of staying physically active during the day and using compression on the legs in the evening is a reasonable starting point, especially for mild symptoms.
For anxiety-driven foot movement, the fix is upstream: managing the anxiety itself through regular exercise, stress reduction, and, when needed, therapy or medication. If akathisia from a medication is the cause, adjusting the dose or switching to a different drug typically resolves it.