TSH refers to thyroid stimulating hormone. Low thyroid stimulating hormone can be caused by hypopituitarism, hyperthyroidism due to non-thyroid stimulating hormone tumors, etc. Low thyroid stimulating hormone can also be caused by the intake of aspirin, corticosteroids, and the intravenous use of heparin. Thyroid stimulating hormone is secreted by the pituitary gland and plays a key role in the functional control of the hypothalamic-pituitary-thyroid axis. The normal range of thyroid stimulating hormone is 0.35~5.5μIU/ml. Due to the different examination methods and reagents, the reference indexes are different in different hospitals and need to be analyzed specifically. If you find that your thyroid stimulating hormone is low, you need to go to the endocrinology department of a regular hospital for examination and follow the doctor’s instructions for active treatment.