Thyroid hormone has the effect of promoting metabolism, growth and development, and increasing nerve excitability. 1. Thyroid hormone has the obvious effect of promoting metabolism, increasing the basal metabolic rate, promoting the breakdown of carbohydrates, proteins and fats, which is conducive to maintaining the normal metabolism of the human body. 2. Thyroid hormone also has the effect of promoting growth and development, can promote protein synthesis, is conducive to the normal growth and development of bones and brain function, if the lack of will lead to shortness and mental retardation, cretinism, or hypothyroidism. 3. Thyroid hormones are also important in maintaining the excitability of the nervous system. It is recommended that patients who are found to have abnormal thyroid function seek prompt medical attention.