what type of infection causes subacute thyroiditis
Causes. Subacute thyroiditis is a rare condition. It is thought to be caused by a viral infection. The condition often occurs after a viral infection of the upper respiratory tract, such as mumps and influenza, or a common cold.ast reviewed: May 10, 2014. Subacute thyroiditis involves swelling (inflammation) of the thyroid gland that usually follows an upper respiratory infection.