The clinical manifestations of hyperthyroidism leading to exuberant metabolism are as follows: 1. Digestive system: it mainly manifests as good eating, easy excitement, strong appetite, easy hunger, and at the same time, there will be hyperactive intestinal sounds, diarrhea, and increased frequency of stools and other symptoms; 2. Nervous system: it mainly manifests as symptoms of insomnia, dreaminess, irritability, fear of heat, and excessive sweating, and even muscle tremors in some patients; 3. Cardiovascular system: the patients will have a accelerated heart rate, and even tachyarrhythmia such as atrial fibrillation; 4. Other: patients will experience significant weight loss. Common causes of hyperthyroidism include nodular goiter, diffuse goiter, high-functioning autonomic adenoma of the thyroid gland, and Hashimoto’s hyperthyroidism, etc. After suspecting that a patient is suffering from hyperthyroidism, he or she should immediately undergo a thyroid function test. Currently, there are five indicators for assessing thyroid function, including FT3, FT4, TT3, TT4, and TS. Patients with hyperthyroidism have significantly higher levels of FT3, FT4, as well as TT3 and TT4, and lower levels of TSH. At the same time, relevant antibody tests including TSH receptor antibody, TSH secondary antibody and other relevant antibodies should be further improved to help clarify the cause of hyperthyroidism. Thyroid ultrasonography can directly observe the size and morphology of the thyroid gland, and has better diagnostic value for nodular goiter, diffuse goiter, high-functioning autonomic adenoma and thyroid tumor.