Thyroiditis, based on its cause, can be classified into subtypes such as subacute thyroiditis and autoimmune thyroiditis. Subacute thyroiditis is primarily caused by viral infections leading to the destruction of the thyroid follicular structure, and it is not contagious. Autoimmune thyroiditis primarily involves the presence of autoantibodies within the body, which lead to the destruction of thyroid follicles and consequently to the apoptosis of thyroid cells. This cause is also non-contagious. Therefore, thyroiditis cannot be transmitted, but it does have genetic susceptibility. For patients whose parents have thyroiditis, their children may also have thyroiditis.