Hashimoto's thyroiditis does not cause a sore throat; the type of thyroiditis that primarily causes a sore throat is subacute thyroiditis. Subacute thyroiditis is a viral infection and is a self-limiting disease. Its main clinical manifestations include sore throat, thyroid enlargement, as well as accompanying fever and elevated erythrocyte sedimentation rate. Meanwhile, Hashimoto's thyroiditis is an autoimmune disease, whose most common clinical manifestation is painless thyroid enlargement, progressing to hypothyroidism in later stages. Additionally, it involves thyroid antibodies, especially positive TPO antibodies. Because the treatments for each are different, it is important to note that Hashimoto's thyroiditis does not cause a sore throat.