The differences between thyroid hormone and adrenaline are mainly as follows: First, the secreting glands are different. Thyroid hormone is secreted by the thyroid gland, while adrenaline is a kind of catecholamine. Catecholamines, including epinephrine and norepinephrine, are secreted by the adrenal medulla. Second, the role is different. Thyroid hormone can promote human growth and development, promote the metabolism of three major substances, promote the process of thermogenesis, and can affect the development of the nervous system. Adrenaline plays a similar role to sympathetic excitation, can raise blood sugar and blood pressure, accelerate heart rate, enhance myocardial contraction, play an important role in the stress response, and is an important emergency hormone. Third, the performance in deficiency is different. Thyroid hormone deficiency tends to form hypothyroidism, and in children or fetuses, thyroid deficiency not only affects physical development but also intellectual development, resulting in cretinism. Adrenaline is an important hormone when the body is under stress, and severe adrenaline deficiency can affect the body’s ability to survive.