Thyroid stimulating hormone (TSH) is a hormone secreted by the pituitary gland to promote the synthesis and secretion of thyroid hormones, which can reflect part of the function of the thyroid gland. TSH is secreted by the pituitary gland and regulated by TRH secreted by the hypothalamus, as well as by the negative feedback regulation of thyroid hormones. elevated TSH can be seen in hypothyroidism, subclinical hypothyroidism, pituitary tumors and other disorders; reduced TSH can be seen in hyperthyroidism, subclinical hyperthyroidism and other diseases. TSH is an important hormone in the human body, which is important for regulating the internal environmental homeostasis of the body. Once abnormalities are detected, you should go to the hospital in a timely manner to complete the thyroid function tests and under the guidance of a professional doctor.