How is thyroiditis treated?

Thyroiditis refers to inflammation of the thyroid gland and encompasses several distinct clinical entities, each with unique etiologies, natural histories, and treatment approaches. Accurate diagnosis—based on clinical presentation, thyroid function tests (TSH, free T4, free T3), thyroid autoantibodies (e.g., thyroperoxidase antibodies [TPOAb], thyroglobulin antibodies [TgAb]), and sometimes thyroid ultrasound or radioactive iodine uptake—is essential before initiating therapy.

For subacute thyroiditis (de Quervain’s thyroiditis), which is typically viral in origin and presents with neck pain, fever, and transient thyrotoxicosis followed by hypothyroidism and eventual recovery, management is primarily supportive. Nonsteroidal anti-inflammatory drugs (NSAIDs) are first-line for mild symptoms; corticosteroids (e.g., prednisone 20–40 mg daily, tapered over 4–6 weeks) are indicated for severe pain or NSAID failure. Antithyroid medications are not used, as hormone excess results from glandular destruction—not autonomous overproduction.

In autoimmune thyroiditis—most commonly chronic lymphocytic (Hashimoto’s) thyroiditis—treatment depends on thyroid function status. Patients with overt hypothyroidism (elevated TSH and low free T4) require lifelong levothyroxine replacement therapy, dosed according to weight, age, cardiac status, and TSH targets (typically 0.5–2.5 mIU/L in most adults). Those with subclinical hypothyroidism (elevated TSH but normal free T4) may be observed or treated based on symptom burden, antibody positivity, TSH level (>10 mIU/L generally warrants treatment), and pregnancy status. Thyroid hormone supplementation is not indicated in euthyroid individuals, even with positive antibodies.

Postpartum thyroiditis—a transient autoimmune form occurring within 12 months after delivery—often follows a triphasic pattern: thyrotoxicosis, hypothyroidism, and spontaneous resolution. Beta-blockers (e.g., propranolol) may be used short-term for symptomatic thyrotoxicosis; levothyroxine is reserved for persistent or symptomatic hypothyroidism. Approximately 20% of affected women develop permanent hypothyroidism and require long-term replacement.

Drug-induced (e.g., interferon-alpha, lithium, checkpoint inhibitors) or radiation-induced thyroiditis requires discontinuation or dose adjustment of the offending agent when feasible, along with supportive care. In cases of acute suppurative thyroiditis—an uncommon bacterial infection—prompt intravenous antibiotics and, if an abscess is present, surgical or percutaneous drainage are critical.

Regular monitoring of thyroid function is vital across all forms, especially during active phases or after treatment initiation. Patients should be counseled that thyroiditis is often manageable but may necessitate long-term endocrine follow-up to detect evolving dysfunction or complications.