Background
- Vaguely classified into:
- Chronic autoimmune thyroiditis (Hashimoto thyroiditis)
- Painless or silent thyroiditis
- Postpartum thyroiditis
- Subacute thyroiditis (also called subacute granulomatous, nonsuppurative, de Quervain, giant cell, or painful thyroiditis)
- Thought to be viral or post-viral in many patients, particularly Coxsackievirus, mumps, measles, adenovirus, SARS-CoV-2, and others
- Infectious thyroiditis (suppurative thyroiditis), typically caused by bacteria via hematogenous spread
- Fibrous thyroiditis (Riedel or invasive thyroiditis)
