Both thyroid hormone and growth hormone can promote the growth and development of the body, but the main differences are as follows: First, the secreting glands are different: thyroid hormone is secreted by the thyroid gland, while growth hormone is secreted by the pituitary gland. Thyroid hormone not only promotes the growth and development of the body and the process of heat production, but also promotes the development of the nervous system. Growth hormone mainly promotes the growth of long bones, the formation and differentiation of cartilage, and the growth of the body. Third, the performance of deficiency is different. The deficiency of thyroid hormone can cause hypothyroidism, and low thyroid hormone in children not only affects growth and development, but also affects intellectual development to form cretinism. The lack of growth hormone in children can lead to slow growth or stop forming short, but the lack of growth hormone does not affect intellectual development. The increase of thyroid hormone is called hyperthyroidism, while excessive growth hormone can lead to gigantism before puberty and acromegaly after puberty.