Thyroiditis usually refers to subacute thyroiditis in clinical terms, and its symptoms mainly include the following: Firstly, early stages of the disease typically involve neck pain accompanied by fever, which usually occurs in the afternoon or evening. If it coincides with hyperthyroidism, additional symptoms may include palpitations, weight loss, insomnia, tremors, excessive sweating, increased appetite, irritability, and mood swings commonly associated with hyperthyroidism. Therefore, if these symptoms are present, it is advised to promptly visit the endocrinology department of a hospital for a complete thyroid function test, erythrocyte sedimentation rate, blood routine, and thyroid ultrasonography to establish a clear diagnosis.