This thyroiditis is also known as "Painless Thyroiditis.

. Subacute lymphocytic thyroiditis is a form of thyroiditis that is also known as silent thyroiditis or painless thyroiditis. Subacute lymphocytic thyroiditis may occur at any age and is more common in females. A variant of subacute lymphocytic thyroiditis occurs postpaum, postpaum thyroiditis. Both of these entities can be considered subtypes of Hashimoto&;s thyroiditis and have an autoimmune basis. Anti-thyroid antibodies are common in all three and the underlying histology is similar. This disorder should not be confused with de Quervain&;s thyroiditis which is another form of subacute thyroiditis.