Restless Legs Syndrome (RLS) is a neurological disorder characterized by a strong and often irresistible urge to move the legs, usually accompanied by unpleasant sensations in the lower limbs.
Symptoms typically appear or worsen during periods of rest, such as when sitting or lying down for prolonged periods, and are most pronounced in the evening and at night. Moving the legs, walking, or stretching usually provides temporary relief.
Because symptoms are often more severe at night, Restless Legs Syndrome can significantly disrupt sleep and, in more severe cases, affect daily functioning and quality of life.
Symptoms of Restless Legs Syndrome
People with Restless Legs Syndrome (RLS) often find it difficult to describe exactly what they feel in their legs. The sensations may be described as tingling, pulling, burning, inner restlessness, or an uncomfortable sensation deep within the lower limbs.
The main characteristics of the syndrome include:
- A strong urge to move the legs
- Unpleasant or unusual sensations in the lower limbs
- Symptoms that appear or worsen during inactivity or rest
- Temporary relief with movement, walking, or stretching
- Symptoms that worsen in the evening or at night
- Difficulty falling asleep or staying asleep
In some patients, the upper limbs may also be affected, particularly when symptoms are more severe.
Causes of Restless Legs Syndrome
Restless Legs Syndrome can occur at any age, although it becomes more common with increasing age. It is more common in women, and in many cases there is a family history of the condition, suggesting a genetic predisposition.
The exact cause is not always known. The regulation of iron within the brain and the function of dopaminergic systems are believed to play important roles in the underlying mechanisms of RLS.
In some people, RLS occurs without another identifiable underlying condition, while in others it may be associated with specific medical conditions or factors.
These may include:
- Iron deficiency or low iron stores
- Pregnancy
- Chronic kidney disease
- Certain neurological or other medical conditions
- Certain medications that may trigger or worsen symptoms
Identifying a possible underlying cause is important, as treating it may significantly reduce symptoms.
Restless Legs Syndrome and Sleep
The relationship between Restless Legs Syndrome and sleep disturbances is particularly important.
Because symptoms usually occur when a person lies down and tries to sleep, they may cause difficulty falling asleep or frequent awakenings during the night.
Chronic sleep disruption may, in turn, lead to daytime fatigue, sleepiness, difficulty concentrating, and a reduced quality of life.
Many patients also experience Periodic Limb Movements of Sleep (PLMS). These are a separate phenomenon and should not be confused with RLS itself.
Diagnosis of Restless Legs Syndrome
The diagnosis of Restless Legs Syndrome is primarily clinical and is based on a detailed assessment of the symptoms and medical history.
The neurological examination may be normal, particularly when there is no other underlying neurological disorder.
It is also important to exclude other conditions that can cause similar symptoms, such as:
- Peripheral neuropathy
- Radiculopathy
- Muscle cramps
- Venous insufficiency
- Akathisia
- Other conditions causing pain or uncomfortable sensations in the lower limbs
Blood tests may also be required, particularly to assess iron stores and ferritin levels, as well as other investigations depending on the patient's medical history and clinical presentation.
Treatment of Restless Legs Syndrome
The treatment of Restless Leg syndrome depends on the frequency and severity of symptoms, their impact on sleep and daily life, and whether an underlying cause is identified.
When iron deficiency or inadequate iron stores are detected, appropriate correction may be an important part of treatment.
Management may also include:
Lifestyle changes: Maintaining a regular sleep schedule, engaging in regular moderate physical activity, and avoiding prolonged periods of inactivity may help some patients.
Identification of aggravating factors: Caffeine and alcohol may worsen symptoms in some individuals. It is also important to review medications that may trigger or aggravate RLS.
Correction of iron deficiency: When blood tests reveal low iron stores, appropriate treatment may be recommended following medical assessment.
Medication: In moderate or severe cases, pharmacological treatment may be required. The choice of medication is individualized according to the characteristics of the symptoms, the patient's medical history, and individual needs.
Follow-Up and Long-Term Management
Restless Legs Syndrome may fluctuate over time, with periods of improvement and worsening. For this reason, regular follow-up is important when symptoms are frequent or require pharmacological treatment.
Particular attention is required during long-term medication treatment, as some therapies may eventually cause a paradoxical worsening of RLS, in which symptoms begin earlier in the day, become more intense, or spread to other parts of the body.
Accurate diagnosis, assessment for possible iron deficiency or other underlying causes, and individualized treatment can significantly improve symptom control, sleep quality, and overall quality of life.