What are the principal types of thyroiditis?

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Types of Thyroiditis

Thyroiditis encompasses six principal types: autoimmune (Hashimoto's) thyroiditis, subacute granulomatous (de Quervain's) thyroiditis, painless (silent) thyroiditis, postpartum thyroiditis, acute suppurative thyroiditis, and invasive fibrous (Riedel's) thyroiditis. 1

Classification Framework

The classification of thyroiditis is fundamentally based on autoimmune versus non-autoimmune etiology, with clinical course (acute, subacute, chronic) serving as a secondary organizing principle. 2

Autoimmune Thyroiditis Types

Chronic Lymphocytic (Hashimoto's) Thyroiditis

  • Most common form, affecting at least 2% of women and representing approximately 20% of all thyroid diseases 2, 3
  • Characterized by positive anti-TPO antibodies in approximately 75% of patients 4
  • Presents insidiously with painless goiter (in up to 60% of patients), hypothyroidism, or both 4, 5
  • Clinical features include cold intolerance, dry skin, constipation, and fatigue 4
  • Diffuse, firm, non-tender goiter on examination with diffuse hypoechogenicity on ultrasound due to lymphocytic infiltration 4, 6
  • TPOAb-positive individuals carry a 4.3% annual risk of progression to overt hypothyroidism 4

Painless (Silent) Thyroiditis

  • Autoimmune disease with positive anti-TPO antibodies in the majority of patients 1
  • Presents with triphasic pattern: thyrotoxicosis, hypothyroidism, then recovery 1
  • Can occur in non-pregnant patients and men, though postpartum period is most common 1
  • Associated with drug-induced thyroid dysfunction from lithium or IFN-α/interleukin-2 therapy (but not IFN-β) 1
  • Recurrent episodes may occur years apart 1

Postpartum Thyroiditis

  • Specific variant of painless thyroiditis occurring in the postpartum period 1, 5
  • Autoimmune origin with transient thyrotoxicosis as predominant feature 5, 3
  • Increasingly recognized and characterized by spontaneously reversible hyperthyroidism 7, 3

Subacute Granulomatous (de Quervain's) Thyroiditis

  • Viral origin presenting with moderate-to-severe anterior neck pain radiating to ears, jaw, or throat 1, 4
  • Acute onset typically following viral illness, with pain starting focally and spreading over several weeks 1, 4
  • Thyroid is firm and exquisitely tender on palpation 1, 4
  • Accompanied by low-grade fever, malaise, marked fatigue, and myalgias 4
  • Markedly elevated ESR and CRP with mild anemia; thyroid autoantibodies are absent 4
  • Ultrasound shows multiple ill-defined, migrating hypoechogenic areas with decreased or normal color-flow Doppler 1, 6
  • Self-limited course with hyperthyroid phase lasting several weeks 4

Non-Autoimmune Thyroiditis Types

Acute Suppurative Thyroiditis

  • Rare bacterial or fungal infection affecting the thyroid 1, 5
  • Etiology involves hematogenous spread or direct extension through fistula from infected pyriform sinus 1
  • Patients generally euthyroid but occasionally present with destructive thyrotoxicosis 1
  • Presents as thyroid abscess requiring systemic antibiotics, abscess drainage, and excision/occlusion of pyriform sinus 1
  • Marked hypoechogenicity on ultrasound 6

Invasive Fibrous (Riedel's) Thyroiditis

  • Exceedingly rare chronic inflammatory disorder of unknown etiology 5, 3
  • Characterized by dense thyroid fibrosis presenting as slowly enlarging anterior neck mass 5, 7
  • Often mimics malignancy and causes thoracic inlet obstruction 7, 3
  • Associated with extracervical foci of fibrosclerosis 3
  • Marked hypoechogenicity on ultrasound 6

Traumatic Thyroiditis

  • Destructive thyroiditis following thyroid trauma 1
  • Presents with thyrotoxicosis from hormone release rather than overproduction 1

Key Diagnostic Distinctions

Differentiating Autoimmune from Viral Thyroiditis:

  • Presence of thyroid pain is pathognomonic for viral (de Quervain's) thyroiditis; autoimmune thyroiditis is painless 4
  • Elevated inflammatory markers (ESR, CRP) indicate viral thyroiditis; absent in autoimmune thyroiditis 4
  • Thyroid autoantibodies present in autoimmune thyroiditis, absent in viral thyroiditis 4
  • RAIU is low during thyrotoxic phase in both conditions and cannot distinguish between them 4

Common Pitfall: During the thyrotoxic phase, all destructive thyroiditides present with low RAIU, which can be confused with other causes of thyrotoxicosis. The key is clinical context: neck pain suggests subacute granulomatous thyroiditis, postpartum timing suggests postpartum thyroiditis, and painless presentation with positive antibodies suggests silent thyroiditis. 1, 4

Management Principles by Type

Destructive Thyroiditis (All Types):

  • Beta-blockers for symptomatic thyrotoxicosis; antithyroid drugs have no utility since hormone synthesis is already suppressed 1, 4
  • Levothyroxine may be used during hypothyroid phase but should be withdrawn after 3-6 months to verify recovery 1

Subacute Granulomatous Thyroiditis:

  • NSAIDs first-line for mild-to-moderate symptoms 1, 4
  • Corticosteroids (prednisone 40 mg daily for 2-4 weeks with taper) for moderate-to-severe symptoms or NSAID failure 1, 4

Autoimmune Thyroiditis:

  • Lifelong levothyroxine for overt hypothyroidism (TSH >10 mIU/L with low free T4) 4
  • Periodic monitoring without immediate treatment for euthyroid patients with positive antibodies 4

Acute Suppurative Thyroiditis:

  • Systemic antibiotics plus abscess drainage/removal and pyriform sinus management 1
  • Beta-blockers for symptomatic thyrotoxicosis if present 1

References

1
Guideline

hyperthyroidism and other causes of thyrotoxicosis: management guidelines of the american thyroid association and american association of clinical endocrinologists.

Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologist, 2011

3
Research

Thyroiditis: a clinical update.

Mayo Clinic proceedings, 1985

4
Guideline

Differentiating Autoimmune (Hashimoto) and Viral (De Quervain) Thyroiditis

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

5
Research

Thyroiditis: differential diagnosis and management.

American family physician, 2000

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.