Thyroid stimulating hormone TSH 0.008μIU/ml is below the lower limit of the normal range and may be more serious. The normal range of thyroid stimulating hormone is 0.35 to 5.5μIU/ml. Due to different examination methods and reagents, the reference indexes are different in each hospital and need to be analyzed specifically. Low thyroid stimulating hormone may be caused by pituitary hypothyroidism, hyperthyroidism due to non-thyroid stimulating hormone tumors, as well as ingestion of aspirin, corticosteroids and intravenous use of heparin. Thyroid-stimulating hormone of 0.008 μIU/ml is found, and endocrinology consultation is recommended to standardize the diagnosis and treatment as prescribed by the doctor.