Hello I read carefully your question and understood your concern. Hashimoto s thyroiditis is caused by an autoimmune process that causes inflammation of the thyroid gland. This condition is the most common cause of hypothyroidism (having too low levels of thyroid hormones) but it doesn t cause pain in the thyroid area. Subacute granulomatous thyroiditis (SAT), also known as painful subacute thyroiditis, is the commonest thyroid condition responsible for neck tenderness.Subacute thyroiditis can cause mild to severe pain in the thyroid gland. The thyroid feels tender to the touch and you feel pain or discomfort when swallowing or turning your head. I need to know more details about your pain: (the details are important for the differential diagnosis) -If you had only one episode of pain or more? -How does the pain last?Does it continue for several days? -Does it change the intensity (if it is a continuing pain)? -Does the pain radiate to the jaw and ears? -Does the pain shifts from side to side or settle in one area? -History of an antecedent viral upper respiratory tract infections? In my opinion there are two alternatives: 1.You have been misdiagnosed and you have not Hashimoto s thyroiditis but subacute thyroiditis. or 2.You have Hashimoto s thyroiditis and the pain can have another origine.The pain in the thyroid area is ofen confused with dental pain, pharyngitis, or otitis. For the diagnose it is necessary to have: -Clinical findings -Free thyroxine (T4) and thyroid-stimulating hormone (TSH) levels -ESR -Radioactive iodine uptake -An antibody test(TPO antibodies). The results of these tests and investigations will give the necessary information to reach the right diagnose and to give the right treatement. For a personalized comprehensive evaluation, treatment recommendations, and individual therapy,you can ask me at HealthCareMagic at my private link: bit.do/hcm-Dr-Xhardo. Thank you for using HCM. Wish you good health.