Thyroid TSH is a thyroid stimulating hormone indicator, which is a very sensitive and specific indicator of thyroid function in clinical practice. Thyrotropin is one of the most important indicators in thyroid function tests, which can sensitively reflect the state of thyroid function and be used to determine whether the thyroid gland is in an overactive or hypothyroid state. Thyroid stimulating hormone index is especially suitable for early detection of the function of the hypothalamic-pituitary-thyroid central regulatory loop. Thyroid stimulating hormone is indicative of some diseases, such as increased thyroid stimulating hormone in primary hypothyroidism, thyroid hormone resistance syndrome, ectopic TSH syndrome, TSH-secreting tumors, etc. Decreased thyroid stimulating hormone can be seen in hyperthyroidism, subclinical hyperthyroidism, PRL tumors, Cushing’s disease, acromegaly, and so on. It is recommended that when thyroid hormone levels are abnormal, do not deal with them blindly, but go to the hospital in time for relevant examinations so as not to miss the best treatment time.