Is Restless Legs Syndrome De Facto Thyroid Disease?

Area of Science:

• Neurology
• Endocrinology
• Immunology

Background:

• Restless Legs Syndrome (RLS) pathogenesis is primarily linked to dopaminergic system dysfunction and iron metabolism.
• A hypothesis suggests thyroid hormone and dopaminergic activity imbalance may initiate RLS.
• This thyroid-hormone-dopamine hypothesis for RLS remains under-investigated.

Purpose of the Study:

• To compare RLS prevalence in patients with common thyroid diseases versus individuals with healthy thyroid glands.
• To investigate the association between thyroid dysfunction and Restless Legs Syndrome.
• To explore potential underlying mechanisms connecting thyroid disease and RLS.

Main Methods:

• Study included 237 participants categorized by thyroid disease status.
• Participants underwent laboratory diagnosis and ultrasound scans.
• RLS diagnosis was assessed using International Restless Legs Syndrome Study Group (IRLSSG) criteria.

Main Results:

• RLS was found to be significantly more prevalent in patients with diagnosed thyroid disease.
• Hashimoto's disease showed a 2.56-fold increased risk for RLS diagnosis compared to the general population.
• A notable association exists between thyroid disease and RLS, though causality is not definitively established.

Conclusions:

• Thyroid disease is significantly associated with a higher prevalence of Restless Legs Syndrome.
• The findings suggest a potential link, possibly autoimmune, between thyroid disorders and RLS.
• Further research is recommended to explore the autoimmune etiology of Restless Legs Syndrome.