What Is Restless Legs Syndrome?

What Does Restless Legs Syndrome Feel Like?

Restless legs syndrome (RLS) is a neurological condition characterized by an urge to move the legs, usually accompanied by uncomfortable sensations. People may describe the sensation as:

• A crawling or creeping feeling
• Pulling or tugging sensations
• Tingling or buzzing
• A deep ache
• An internal restlessness that is hard to describe

Symptoms typically occur or worsen during periods of rest, such as sitting or lying down, and they are usually worse in the evening or at night. Walking, stretching, or moving the legs typically provides at least temporary relief. Because symptoms flare when the body is still, RLS can significantly interfere with falling asleep and staying asleep.

Why Are Restless Legs Worse at Night?

RLS follows a daily rhythm: symptoms tend to be mildest in the morning and build through the day, peaking in the evening and at night. The exact reason is not fully understood, but dopamine pathways are involved in the biology of RLS, and the body's circadian rhythm influences those pathways. That timing is one reason RLS so often disrupts sleep—and why people with RLS may also struggle with daytime fatigue and concentration. For more on how sleep affects the brain, see our sleep and brain health guide and our video on what sleep apnea is.

What Causes Restless Legs Syndrome?

RLS can have several contributing factors, including:

• Iron deficiency or low iron stores
• Pregnancy
• Chronic kidney disease
• Family history and genetics
• Certain medications that can worsen symptoms

It is worth noting that RLS is not simply a dopamine deficiency. Dopamine pathways are involved in the biology of RLS, but the mechanism is more complex, and many people with RLS have no single identifiable cause.

Can Low Iron Cause Restless Legs?

Iron deficiency or low iron stores can contribute to RLS, even when a person is not anemic. For that reason, evaluation may include ferritin and transferrin saturation blood tests when clinically appropriate. Correcting an iron deficiency when present can improve symptoms for some people, so it is one of the first things a neurologist may look for.

How Is Restless Legs Syndrome Diagnosed?

Diagnosis is primarily based on the characteristic symptoms and clinical history: an urge to move the legs that begins or worsens during rest, is worse in the evening or at night, and improves with movement. There is no single test that diagnoses RLS, but blood work and other evaluation can identify contributing factors such as low iron stores, or conditions that can mimic RLS—including tingling in the feet from neuropathy or other nerve problems.

How Is Restless Legs Syndrome Treated?

Treatment depends on the cause and severity. It may include correcting iron deficiency when present, reviewing medications that could worsen symptoms, lifestyle measures such as sleep habits and moderate exercise, and medications when appropriate. Because every patient's situation is different, treatment is tailored rather than one-size-fits-all.

Is It RLS or a Leg Cramp?

These two are often confused. RLS produces an urge to move the legs with unpleasant sensations that improve with movement. A leg cramp involves a painful, involuntary muscle contraction—often a charley horse—that may require stretching the muscle to release. Both can occur at night, but they feel different and are managed differently, which is one reason describing your symptoms carefully matters.

When Should You See a Neurologist?

If restless legs regularly interfere with falling asleep, disrupt your night, or affect how you function during the day, an evaluation with a neurologist can identify contributing factors and build a treatment plan. Neurologists also evaluate related symptoms such as numbness, tingling, tremor, and movement changes— you can learn more on our neuropathy care page or our Parkinson's disease care page.