Hashimoto’s thyroiditis can be diagnosed by thyroid function, antithyroid antibodies, and imaging. 1. Thyroid function: In the early stages of Hashimoto’s thyroiditis, thyroid function may be within normal limits. As the disease progresses, it may lead to hypothyroidism, which is characterized by elevated thyrotropin with decreased total thyroxine, free thyroxine, total triiodothyronine, and free triiodothyronine. 2. Antithyroid antibodies: patients with Hashimoto’s thyroiditis may have elevated thyroglobulin antibodies and thyroid peroxidase antibodies. 3. Imaging: Ultrasonography may show signs of thyroid gland and blood flow. Patients with Hashimoto’s thyroiditis may have diffuse changes in the thyroid gland, and some may have thyroid nodules. Patients suspected of having symptoms of Hashimoto’s thyroiditis are advised to go to the hospital and ask the doctor to make a judgment.