The most common causes of thyroiditis refer to subacute thyroiditis and autoimmune thyroiditis. Subacute thyroiditis is mainly caused by viral infection, leading to the destruction of thyroid follicular cells. This generally results in pain in the thyroid region, which can even radiate to areas like the back of the neck and ears, with the pain symptoms being relatively significant. Meanwhile, Hashimoto's thyroiditis typically does not present with pain, although a small number of patients may experience localized pain during the onset of the disease, but the symptoms are usually mild. Additionally, the pain in the neck thyroid region associated with subacute thyroiditis varies from person to person, with varying degrees of pain intensity. It is primarily treatable with steroids or non-steroidal anti-inflammatory drugs, and generally, the symptoms can be relieved after treatment.