The thyroid gland mainly secretes thyroid hormones, which are important for the normal development of the human body and can effectively regulate energy metabolism and the development of the nervous system in the human body. Excessive secretion of hormones by the thyroid gland can also cause sympathetic excitement, irregular heart rate, palpitations, and easy agitation. Too little hormone secretion by the thyroid gland can cause symptoms such as sleepiness, poor concentration, memory loss, and weakness. Whether the thyroid gland produces too much or too little hormone, it has adverse effects on the human body. Maintaining normal thyroid gland hormone secretion is important for human growth and development. If you find any abnormalities in thyroid hormone secretion, you should go to the hospital for thyroid secretion index examination in time to find the cause according to the test results and treat it in time to avoid pathological changes that may bring many adverse effects to your body.