Thyroid gland is one of the main endocrine organs of human body, which has many influences on human body, including the following aspects: 1. Thyroid gland secretes thyroid hormone, which has many functions and affects many organs and cells. For example, thyroid hormone can maintain human body temperature and play a very important role in regulating body temperature. 2. Thyroid gland also has a very important influence on substance metabolism. For example, thyroid hormone can accelerate sugar metabolism, which has certain influence on the absorption and utilization of sugar and the decomposition and synthesis of glycogen. 3, thyroid hormone can also promote the degradation and excretion of cholesterol in the body, so that blood lipids in the body can reach a balanced state. 4. Thyroid hormone also has a very important influence on brain development, especially the abnormal thyroid function of pregnant women may lead to abnormal fetal brain development. 5. Thyroid gland also has certain influence on human reproductive system. Therefore, through the above analysis, the thyroid gland has many effects on the human body. It is necessary to find the abnormality of thyroid function according to the specific situation and actively treat it to reduce the greatest harm.