Hashimoto's thyroiditis, also known as chronic lymphocytic thyroiditis, is an autoimmune disease. Some patients with Hashimoto's thyroiditis have normal thyroid function and generally do not require treatment, but it is recommended to regularly review thyroid function and have thyroid ultrasonography. Some patients with Hashimoto’s thyroiditis may also suffer from hypothyroidism, which can manifest clinically as fatigue, constipation, and edema. If these symptoms are present, it is advisable to visit an endocrinology specialist promptly, complete thyroid function tests, and use thyroid hormone supplements under the guidance of a doctor.