Thyroid-stimulating hormone generally refers to thyrotropin. High thyrotropin may be caused by primary hypothyroidism, Hashimoto’s disease with hypothyroidism, exogenous thyrotropin-secreting tumors (e.g., lungs, mammary glands), and recovery from subacute thyroiditis. In addition to the above causes, ingestion of lithium metal, potassium iodide, and thyrotropin-releasing hormone can increase thyrotropin. The normal range of thyrotropin is 0.35~5.5μIU/ml. Due to the different examination methods and reagents, the reference indexes of each hospital are different and need to be analyzed specifically. Patients with high thyroid stimulating hormone should go to the hospital and choose the appropriate method of treatment.