Generally speaking, whether a teenager has hypermetabolic syndrome, physical examination and thyroid function tests are used to determine whether he/she has hyperthyroidism. 1. Hypermetabolic syndrome: Due to the increased secretion of thyroid hormones, which leads to accelerated metabolism, patients can see typical symptoms such as fear of heat and excessive sweating, palpitations (accelerated heartbeat, often accompanied by panic attacks), fatigue, hyperphagia, weight loss, and so on. 2. Physical examination: Hyperthyroidism patients usually have varying degrees of goiter, which is diffuse, medium in texture and without tenderness. Tremor can be detected in the upper and lower poles of the thyroid gland. 3. Thyroid function test: the change of thyroid stimulating hormone concentration is the most sensitive indicator to reflect the function of the thyroid gland, serum total thyroxine is one of the main indicators to diagnose hyperthyroidism. Free thyroxine and free triiodothyronine are the main indicators for diagnosing clinical hyperthyroidism. If there is any abnormality of thyroid function, it is necessary to go to the hospital as soon as possible, and the doctor will formulate an individualized diagnosis and treatment plan according to the specific condition, so as to avoid delaying the condition.