Restless leg syndrome: a primer

• A. Sudden loss of muscle strength in the legs
• B. An urge to move the legs, usually accompanied by uncomfortable sensations, that begins or worsens during rest
• C. Constant numbness and tingling in both feet that never changes with activity
• D. Painful cramps that occur only during walking and resolve with stretching

• A. Midday, after eating lunch
• B. Early morning, shortly after waking
• C. Mid-afternoon during physical exertion
• D. Evening and night, especially when lying down or sitting still

• A. Remaining perfectly still in bed
• B. Drinking a large glass of cold water only
• C. Moving or walking around, stretching, or massaging the legs
• D. Lying flat with the legs elevated above the heart

• A. Symptoms must be present in both arms as well as the legs
• B. Symptoms must include visible swelling of the ankles
• C. Symptoms must begin only after the age of 70
• D. Symptoms must be triggered or worsened by rest or inactivity

• A. Regular moderate exercise during the day
• B. Adequate sleep at consistent times
• C. Consumption of caffeine, alcohol, or certain medications such as some antidepressants
• D. Eating a balanced diet rich in vegetables

• A. Sudden loss of muscle strength in the legs
• B. An urge to move the legs, often accompanied by uncomfortable sensations, that begins or worsens during rest ✓
• C. Persistent numbness in the feet that is present at all times
• D. Sharp, shooting pain that radiates down the back of the leg with walking

Why: Restless legs syndrome (RLS) is defined by an urge to move the legs, usually accompanied by uncomfortable or unpleasant sensations, that typically begins or worsens during periods of rest or inactivity. Movement provides at least partial, temporary relief.

• A. Symptoms are worst in the morning and disappear completely by midday
• B. Symptoms are most pronounced in the evening or at night and tend to worsen during rest ✓
• C. Symptoms occur only during vigorous exercise
• D. Symptoms are constant throughout the day regardless of activity level

Why: RLS symptoms are classically worse in the evening and at night, especially when lying down or sitting still for long periods. This circadian pattern is an important diagnostic clue that distinguishes RLS from many other leg complaints.

• A. Crawling, creeping, tingling, or pulling sensations deep within the legs ✓
• B. Warmth and swelling localized to the knee joint
• C. Burning pain on the soles of the feet only when standing
• D. Hair-trigger muscle cramps that last several minutes and resolve with stretching

Why: Patients often describe RLS sensations as crawling, creeping, tingling, itching, aching, or pulling, typically deep within the calves or legs. These descriptions are subjective, which is why clinicians rely on a structured set of diagnostic criteria.

• A. Presence of blood clots confirmed on ultrasound
• B. Symptoms that are relieved by movement and worsen during rest, with no other medical or behavioral cause better explaining them ✓
• C. A positive result on a nerve conduction study of the peroneal nerve
• D. Symptoms that occur only on one side of the body

Why: The IRLSSG criteria require an urge to move the legs (often with uncomfortable sensations) that begins or worsens at rest and is at least partially relieved by movement. Symptoms must not be better explained by another condition such as akathisia, leg cramps, or positional discomfort.

• A. Because RLS is always caused by a single identifiable vitamin deficiency
• B. Because factors such as iron deficiency, kidney disease, pregnancy, and certain medications can cause or worsen RLS-like symptoms and may need to be addressed ✓
• C. Because RLS can only be diagnosed after the patient has been observed sleeping
• D. Because asking about triggers is required to rule out spinal tumors in every case

Why: Secondary causes and aggravating factors such as iron deficiency, chronic kidney disease, pregnancy, peripheral neuropathy, and medications like certain antidepressants and antihistamines are common. Identifying them guides treatment and can sometimes resolve or reduce symptoms.

• A. Regular aerobic exercise
• B. Iron deficiency ✓
• C. High fiber diet
• D. Adequate sleep duration

Why: Iron deficiency, even without anemia, is one of the most consistently identified risk factors for RLS. Low brain iron levels are thought to disrupt dopamine signaling, which contributes to symptoms.

• A. Young children under age 5
• B. Adolescents with no family history
• C. Pregnant women ✓
• D. Adults over 60 with no health conditions

Why: RLS is notably more common during pregnancy, particularly in the third trimester, and often resolves after delivery. Hormonal changes and iron demands during pregnancy are thought to contribute.

• A. Acetaminophen
• B. Antihistamines such as diphenhydramine ✓
• C. Vitamin D supplements
• D. Antibiotics such as amoxicillin

Why: Many antihistamines, along with certain antidepressants and antipsychotics, can worsen RLS symptoms. Patients taking these medications may benefit from discussing alternatives with their clinician.

• A. Kidney failure causes direct damage to leg nerves
• B. Kidney dysfunction often leads to iron deficiency and uremia, which can contribute to RLS ✓
• C. Dialysis removes dopamine from the bloodstream
• D. Kidney disease increases muscle mass in the legs

Why: Chronic kidney disease is linked to RLS through mechanisms including iron deficiency, uremic toxins affecting the nervous system, and dialysis-related factors. RLS prevalence is notably high among dialysis patients.

• A. RLS is never inherited and is always caused by lifestyle factors
• B. RLS has no genetic link and occurs randomly
• C. Having a family history of RLS, especially in early-onset cases, increases the risk ✓
• D. Only identical twins can develop RLS

Why: Family history is a significant risk factor for RLS, particularly for early-onset disease. Several genetic variants have been identified that are associated with increased susceptibility.

• A. Sudden loss of muscle strength in the legs
• B. An urge to move the legs, often with uncomfortable sensations, that worsens during rest ✓
• C. Constant numbness in the feet that persists during walking
• D. Sharp pain in the calf that occurs only during exercise

Why: Restless legs syndrome is defined by an urge to move the legs, usually accompanied by uncomfortable sensations such as crawling, tingling, or aching. Symptoms typically worsen during periods of rest or inactivity and are often relieved by movement.

• A. Muscles naturally weaken after sunset
• B. Blood circulation to the legs is completely blocked during sleep
• C. Symptoms tend to intensify during rest and inactivity, which are more common in the evening and at night ✓
• D. Daylight suppresses the nerves that cause leg sensations

Why: Symptoms commonly peak in the evening and at night because they are triggered or worsened by rest and inactivity. This daily pattern is a key feature that helps distinguish restless legs syndrome from other conditions.

• A. It causes excessive sleepiness throughout the entire day only
• B. It makes it difficult to fall asleep and can cause frequent awakenings during the night ✓
• C. It has no effect on the quality of sleep
• D. It causes the person to sleep too deeply to wake up

Why: The urge to move and uncomfortable sensations can delay sleep onset and interrupt sleep repeatedly. This leads to poor sleep quality, which in turn can cause daytime tiredness, fatigue, and difficulty concentrating.

• A. Sitting still in a long meeting
• B. Lying flat in bed without moving
• C. Walking or stretching the legs ✓
• D. Sitting in a dark room with the legs crossed

Why: Movement such as walking, stretching, or shifting the legs typically provides temporary relief from the urge to move. This is why people with restless legs syndrome often find sitting or lying still during rest periods especially difficult.

• A. It usually improves concentration and energy during the day
• B. It has no effect outside of nighttime hours
• C. It can reduce daytime alertness, mood, and ability to work or enjoy activities that require sitting, such as travel or movies ✓
• D. It only affects people who are physically active

Why: Because restless legs syndrome disrupts sleep, it often leads to daytime fatigue, irritability, and reduced concentration. Its symptoms can also make prolonged sitting, such as during flights, meetings, or films, uncomfortable, which can limit social and work activities.

• A. Hypothyroidism
• B. Iron deficiency ✓
• C. Vitamin C deficiency
• D. Hyperglycemia

Why: Iron deficiency, including low ferritin levels even without anemia, is one of the most consistently identified associations with RLS. Iron is a cofactor in dopamine synthesis in the brain, and low brain iron is thought to contribute to symptoms. Checking ferritin is a standard part of RLS evaluation.

• A. Chronic kidney disease requiring dialysis ✓
• B. Acute kidney stones
• C. Urinary tract infections
• D. Polycystic ovary syndrome

Why: RLS is significantly more prevalent among patients with end-stage kidney disease, particularly those undergoing hemodialysis. The prevalence in this population can be several times higher than in the general population, and uremia and iron imbalances are thought to contribute.

• A. It directly causes muscle spasms in the calves
• B. Nerve dysfunction can produce abnormal sensations in the legs that overlap with RLS symptoms
• C. It always coexists with iron overload
• D. It eliminates the urge to move the legs

Why: Peripheral neuropathy, such as that seen in diabetes, can produce paresthesias and discomfort in the legs. These sensations can overlap with RLS symptoms, and the two conditions can coexist, which is why clinicians evaluate for neuropathy in patients with suspected RLS.

• A. Pregnancy directly damages leg nerves
• B. Increased iron demand and hormonal changes, particularly in the third trimester ✓
• C. Pregnancy eliminates the body's dopamine
• D. Pregnancy causes permanent vitamin B12 deficiency

Why: RLS symptoms commonly emerge or worsen during pregnancy, especially in the third trimester. Contributing factors include increased iron demands, iron depletion, and hormonal shifts. Symptoms often improve after delivery, though this is not universal.

• A. Beta-blockers
• B. Antihistamines with sedating properties ✓
• C. Anticoagulants
• D. Corticosteroids

Why: Sedating antihistamines (such as diphenhydramine), along with certain antidepressants and antipsychotics, may worsen RLS symptoms in some people. Clinicians often review medications as part of the evaluation, since removing or changing an aggravating drug can reduce symptoms.

• A. Drinking large amounts of caffeinated beverages in the evening
• B. Maintaining a regular sleep schedule and going to bed at consistent times ✓
• C. Engaging in intense exercise immediately before bedtime
• D. Eating a large meal shortly before lying down

Why: A consistent sleep schedule supports healthier sleep overall and can reduce the sleep disruption that often accompanies restless legs syndrome. Caffeine, intense late-night exercise, and large meals close to bedtime can all worsen symptoms.

• A. Both substances directly cure the urge to move the legs
• B. Both substances can worsen symptoms and disrupt sleep quality ✓
• C. Both substances increase iron absorption in the bloodstream
• D. Both substances have no measurable effect on the nervous system

Why: Caffeine is a stimulant that can aggravate RLS symptoms, and alcohol can fragment sleep and worsen symptoms in many people. Reducing or avoiding them is a common self-care recommendation.

• A. Prolonged sitting in a single position for several hours
• B. Regular moderate physical activity such as walking ✓
• C. Sleeping in a heated room with heavy blankets
• D. Avoiding all forms of movement after dinner

Why: Regular moderate exercise such as walking is often associated with symptom relief for many people with RLS. Prolonged inactivity tends to worsen symptoms, which is why sitting still for long periods can be problematic.

• A. Stretching, massaging the legs, or taking a warm bath ✓
• B. Standing motionless with the legs locked straight
• C. Lying flat and holding the breath until the urge passes
• D. Drinking a strong energy drink to stay alert

Why: Gentle stretching, leg massage, and warm baths are simple, low-risk measures that many people find provide temporary relief. Energy drinks contain caffeine, which can worsen symptoms.

• A. It replaces the need for any medical evaluation
• B. It helps identify patterns, triggers, and the effects of lifestyle changes ✓
• C. It guarantees that symptoms will disappear within a week
• D. It is required by law for all people diagnosed with RLS

Why: Tracking when symptoms occur, what foods, drinks, medications, or activities preceded them, and how sleep was affected can reveal personal triggers and show whether self-care changes are helping. This information is also useful when discussing treatment with a clinician.

• A. Oral corticosteroids
• B. Dopamine agonists such as pramipexole or ropinirole ✓
• C. Long-term opioid therapy
• D. Benzodiazepines taken daily for sleep

Why: Dopamine agonists such as pramipexole and ropinirole are widely recommended first-line pharmacological treatments for RLS. They act on dopamine pathways that are thought to be dysfunctional in the condition. Corticosteroids, long-term opioids, and daily benzodiazepines are not standard first-line choices.

• A. Tolerance
• B. Withdrawal
• C. Augmentation ✓
• D. Remission

Why: Augmentation is a paradoxical worsening of RLS symptoms, typically occurring with dopaminergic medication. Symptoms begin earlier in the day, spread to other body parts, and increase in intensity. Switching to a different class of medication, such as an alpha-2-delta ligand, is often recommended.

• A. Alpha-2-delta ligands such as gabapentin or pregabalin ✓
• B. Antibiotics such as doxycycline
• C. Beta-blockers such as propranolol
• D. Anticoagulants such as warfarin

Why: Alpha-2-delta ligands, including gabapentin and pregabalin, are effective for RLS and are often preferred when augmentation occurs with dopamine agonists. They are not associated with the same augmentation risk. Antibiotics, beta-blockers, and anticoagulants are not standard RLS treatments.

• A. Hypothyroidism
• B. Iron deficiency with a low serum ferritin level ✓
• C. Vitamin B12 excess
• D. Elevated blood glucose

Why: Iron deficiency, particularly with serum ferritin below about 75 micrograms per liter, is strongly linked to RLS severity. Iron repletion, including intravenous iron in appropriate cases, can significantly reduce symptoms. Iron status should be checked in all patients with RLS.

• A. Avoiding sleep entirely
• B. Regular moderate exercise and good sleep hygiene ✓
• C. Eating large meals just before bed
• D. Prolonged periods of sitting without movement

Why: Regular moderate exercise, good sleep hygiene, and avoiding triggers such as caffeine, alcohol, and certain antihistamines are typically recommended as initial measures for mild RLS. Prolonged inactivity tends to worsen symptoms, while regular activity can help reduce them.