What Is Restless Leg Syndrome and How Is It Diagnosed?

That nagging, creepy-crawly feeling in your legs at night that makes you want to kick them out from under the covers? You're not alone, and it's not just in your head. Restless Legs Syndrome (RLS) is a real neurological condition that affects millions of people, and learning how restless leg syndrome is diagnosed is the first step toward getting real relief.

What Is Restless Legs Syndrome?

Restless Legs Syndrome, also known as Willis-Ekbom disease, is a common neurological sensory motor disorder that causes an irresistible urge to move the legs, often paired with strange "creeping" or "crawling" leg sensations deep within the lower limbs [1]. These uncomfortable sensations in your legs typically flare up when you're sitting still or trying to fall asleep, and they tend to worsen in the evening and overnight [1].

If movement gives you temporary relief, such as walking, stretching, or pacing, that's a classic clue. People with restless legs syndrome often describe a powerful pull to move their legs just to make the sensation stop [1].

How common is RLS? An estimated 5% to 15% of adults in Northern Europe and North America experience RLS, and it's particularly common in older adults and women [1]. It's not just adults, either. RLS in children does occur, though it's frequently misdiagnosed as growing pains.

"Restless legs syndrome (RLS) is a common neurological sensory-motor disorder that is characterized by intense restlessness and unpleasant creeping sensations deep inside the lower legs." — Karl Ekbom, MD, PhD, Department of Neurology, Karolinska University Hospital/Huddinge [1]

Signs and Symptoms of RLS

The signs and symptoms of restless legs syndrome go beyond simple fidgeting. While each person may describe their symptoms a little differently, most patients with RLS report:

• An urge to move their legs paired with itching, tingling, throbbing, or "pins and needles" sensations

• Symptoms that begin or worsen during periods of rest

• Relief, partial or full, when they move their legs or stretch

• Worsening of symptoms in the evening or at night [3]

  
  

Many people with RLS also experience periodic limb movement disorder. It is described as repetitive, involuntary leg movement during sleep that can wake both the patient and their bed partner. This overlap is why RLS is often classified as both a movement disorder and a sleep disorder.

Mild symptoms may only happen occasionally, while severe symptoms can occur nightly and seriously disrupt rest. Without intervention, RLS symptoms can worsen over time.

What Causes RLS?

Honestly, the cause of RLS is unknown in many cases, but researchers have made huge strides in understanding what may contribute to RLS and what makes RLS symptoms worse.

Genetic Factors

A major role for genetic factors is supported by the high frequency of positive family history in patients with RLS, plus higher concordance rates in identical twins compared to fraternal twins [2]. Variants of the genes PTPRD, BTBD9, and MEIS1 are the strongest candidates associated with RLS [2]. Inheritance often follows an autosomal-dominant pattern with variable expressivity, meaning relatives may have very different ages of onset or severity [2].

"A major role of genetic factors in the risk of developing restless legs syndrome (RLS) is supported by the high frequency of positive family history of RLS in patients affected with this disease..." — Félix J. Jiménez-Jiménez, MD, PhD, University Hospital of the Principality of Asturias [2]

Primary vs. Secondary RLS

Type	Description
Primary (idiopathic)	Often genetic; no clear underlying medical cause
Secondary (symptomatic)	Linked to iron deficiency, kidney failure, or pregnancy [2]

Other Triggers and Contributors

• Iron deficiency: Low brain iron stores affect dopamine production, a key player in motor control

• Caffeine, alcohol, and nicotine can cause RLS symptoms to worsen

• Antidepressant medications, antihistamines, and other certain medications may trigger or worsen symptoms

• Pregnancy, especially during the third trimester

  
  

The dopamine connection matters. Medications that increase dopamine activity are often used in the treatment of RLS, since dopamine pathways appear central to this condition.

How Is Restless Leg Syndrome Diagnosed?

Here's the question most people ask: How is restless leg syndrome diagnosed when there's no blood test or scan that confirms it? The answer? It's a clinical diagnosis. There is no single test to diagnose RLS [3]. Instead, your doctor relies on your medical history, a physical and neurological exam, and a careful review of your symptoms.

The Four Essential Diagnostic Criteria

When RLS is suspected, your neurologist will check whether your experience meets four core criteria established by the International Restless Legs Syndrome Study Group [3]:

1. An urge to move the legs, usually accompanied by an uncomfortable sensation

2. Symptoms begin or worsen during rest or inactivity

3. Symptoms are partially or totally relieved by movement

4. Symptoms are worse in the evening or at night [3]

   
   

What Else Your Doctor Will Check

So, how is restless leg syndrome diagnosed beyond those four questions? Clinicians typically:

• Order blood work, especially serum ferritin, to check for iron deficiency, with levels below 50 ng/mL often justifying iron replacement [3]

• Review your medical history and current medications

• Ask about family history (since genetics matter)

• Rule out conditions that mimic RLS, including peripheral neuropathy, akathisia, and nighttime leg cramps [3]

  
  

"The diagnosis is clinical, requiring an urge to move the legs usually accompanied by an uncomfortable sensation, occurrence at rest, improvement with activity, and worsening of symptoms in the evening or at night." — Max Bayard, MD, Associate Professor, East Tennessee State University Quillen College of Medicine [3]

Test for RLS in Sleep Studies

There's no specific test for RLS itself, but your neurologist may order a sleep study called a polysomnography. This is especially the case when periodic limb movement disorder is suspected. The American Academy of Sleep Medicine recognizes that overnight studies can confirm associated leg movement during sleep, though they aren't required for diagnosis.

Distinguishing RLS From Look-Alike Conditions

Some neurological conditions can resemble RLS, which is why expert evaluation matters. For instance, abnormal jerking movements can be mistaken for muscle weakness when they're actually something else entirely. Similarly, Parkinson's mimics can fool even experienced clinicians, which is exactly why a thorough neurological assessment is so important.

Treatment Options for Restless Legs Syndrome

Now that we've covered how restless leg syndrome is diagnosed, let's talk about diagnosis and treatment together. While there is no permanent cure for RLS, many evidence-based treatments for restless legs syndrome can effectively reduce symptoms and help relieve them.

Lifestyle Approaches

For mild symptoms, simple changes can help:

• Practice consistent sleep hygiene

• Limit caffeine, alcohol, and nicotine

• Add moderate daily exercise and avoid vigorous workouts close to bedtime

• Try warm baths, leg massages, and stretching before bed

• Address iron deficiency through diet or supplements under medical supervision

  
  

RLS Medications

Persistent cases of RLS often require a combination of medications as part of the treatment of restless legs syndrome. Common options include:

• Dopamine agonists (ropinirole, pramipexole) — medications that increase dopamine

• Alpha-2-delta calcium channel ligands (gabapentin enacarbil, pregabalin)

• Iron supplementation when ferritin levels are low

• Opioids reserved for severe, treatment-resistant cases

  
  

Treatment for RLS is highly individualized. What works for one person may not help another. Living with restless legs syndrome means working closely with your neurologist to fine-tune your plan over time. While some famous individuals have publicly battled neurological conditions like Parkinson's, such as the beloved actor Michael J. Fox, millions more quietly manage RLS every night. Effective treatment options are available.

Managing RLS Symptoms Long-Term

Managing RLS symptoms is a marathon, not a sprint. New treatment approaches continue to emerge, and ongoing research from groups like the Restless Legs Syndrome Study Group is shaping how we approach diagnosis and management. If your symptoms worsen or current therapies stop working, talk to your neurologist. Adjusting your plan can help relieve your symptoms again.

Get Expert Neurological Care at Neurology Associates

Are you or a loved one struggling with restless legs syndrome or another neurological condition and looking for the right specialist to guide your care? Whether you're navigating RLS, periodic limb movement disorder, sleep disturbances, or other neurological concerns, a comprehensive evaluation can bring clarity and direction. Choosing the right neurologist can greatly improve your quality of life, and that journey starts with finding the right fit.

Neurology Associates Neuroscience Center in Chandler and Mesa, Arizona, provides comprehensive neurological care rooted in current scientific evidence and evidence-based clinical practices. Our experienced team of neurologists can:

• Conduct detailed evaluations and make a diagnosis based on your symptoms and history

• Develop an individualized treatment plan suited to your specific condition

• Manage coordinated care from your first visit through long-term ongoing care

• Provide guidance on evidence-based treatment options, including emerging therapies

• Offer expert referrals to a neurosurgeon or other healthcare providers when appropriate

• Help you understand your neurological disorder and what to expect going forward

  
  

Finding the right neurologist shouldn't feel overwhelming. With Neurology Associates, it doesn't have to. Our team takes the time to understand your unique situation and tailor your care accordingly, from your very first visit onward.

Contact us today to schedule an appointment and take your first step toward expert neurological care.

This blog post is for informational purposes only and not medical advice. Always consult a qualified healthcare provider for diagnosis or treatment decisions regarding any neurological condition or other health concern. Do not rely on this content as a substitute for professional medical guidance.

References

[1] Ekbom, K., & Ulfberg, J. (2009). Restless legs syndrome. Journal of Internal Medicine, 266(5), 419–431.https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-2796.2009.02159.x

[2] Jiménez-Jiménez, F. J., Alonso-Navarro, H., García-Martín, E., & Agúndez, J. A. G. (2017). Genetics of restless legs syndrome: An update. Sleep Medicine Reviews, 37, 108–121.https://www.sciencedirect.com/science/article/abs/pii/S1087079217301545

[3] Bayard, M., Avonda, T., & Wadzinski, J. (2008). Diagnosis and management of restless legs syndrome. American Family Physician, 78(2), 235–240. https://www.aafp.org/pubs/afp/issues/2008/0715/p235.html