Treatment of Mood Swings and Anxiety in Hypothyroidism

Introduction to Thyroid-Anxiety Relationship

Patients with anxiety disorders have significantly higher rates of comorbid thyroid disorders, and this relationship exists independent of depression, according to the Depression and Anxiety journal 1, 2
Thyroid hormone receptors are widely expressed throughout the limbic system, directly affecting mood regulation pathways, as reported in the Depression and Anxiety journal 3

Hypothyroid patients demonstrate blunted TSH responses to TRH stimulation, suggesting subtle HPT axis dysfunction contributes to anxiety symptoms even when baseline thyroid levels appear normal, as found in the Depression and Anxiety journal 4, 5

Beta-blockers can be used specifically for peripheral manifestations of anxiety, such as palpitations, tremor, and tachycardia, rather than as primary anxiolytic agents, as suggested by Praxis Medical Insights 6
Hyperthyroidism causes anxiety-like symptoms, including nervousness, restlessness, palpitations, and increased perspiration, that overlap with primary anxiety disorders, according to Praxis Medical Insights 6

It is essential to monitor both psychiatric symptoms and thyroid parameters together, as they are interconnected, and consider that mood symptoms may precede overt thyroid dysfunction, as reported in the Depression and Anxiety journal 1, 4

In patients with anxiety disorders, thyroid dysfunction is markedly more common than in the general population, prompting routine thyroid screening as part of psychiatric care. 7
Women diagnosed with generalized anxiety disorder exhibit a thyroid disorder prevalence of approximately 10.4%, which exceeds prevalence rates observed in the general population. 7
Among individuals with panic disorder, thyroid disease prevalence is 2.2% in men and 9% in women; female rates surpass general‑population estimates. 7
Community‑based investigations consistently demonstrate a significant association between anxiety disorders and thyroid disorders, although some older‑adult cohorts have shown inconsistent replication. 7

Subclinical thyroid dysfunction—including subclinical hypo‑ or hyperthyroidism and positive thyroid peroxidase antibodies—is present in 19.7%–39.3% of patients with panic disorder. 7
Positive thyroid peroxidase (TPO) antibodies are detected in 21.4% of panic disorder patients, indicating an autoimmune contribution to the psychiatric‑thyroid overlap. 7

Clinical guidelines recommend routine thyroid screening for patients being treated for anxiety disorders, emphasizing the use of sensitive TSH measurement as the initial test. 8, 9