There is no such thing as subacute hyperthyroidism, which may refer to hyperthyroidism due to subacute thyroiditis. There are usually symptoms of subacute thyroiditis and hyperthyroidism, such as thyroid gland pressure and pain, goiter, palpitation, sweating and other symptoms. 1. Inflammatory symptoms: localized inflammation of the thyroid gland leads to goiter and tenderness, with varying degrees of pain, which can be aggravated by turning the neck and swallowing movements. 2. Symptoms of hyperthyroidism: Symptoms of hyperthyroidism include palpitations, sweating, and fear of heat, which are due to the destruction of the thyroid gland leading to a massive release of thyroid hormones. When subacute thyroiditis occurs, it is recommended to seek timely medical attention, follow the doctor’s instructions for examination, and choose the appropriate treatment plan under the doctor’s comprehensive analysis.