Firstly, it is important to check thyroid function for Hashimoto's thyroiditis, which involves a specific antibody, the anti-thyroid peroxidase antibody (TPOAb). If this antibody is significantly elevated, it supports the diagnosis of Hashimoto's thyroiditis. Additionally, a thyroid ultrasound should be combined, and if there is severe enlargement, a thyroid fine-needle aspiration can be conducted to assist in treatment. After a confirmed diagnosis of Hashimoto's thyroiditis, it is also necessary to assess thyroid function to determine if there is concurrent hyperthyroidism or hypothyroidism. Treatment should then be administered based on the specific condition of the patient.