1, the anatomy of the thyroid gland: The thyroid gland is in the front of the neck, below the throat, like a butterfly with unfolded wings, surrounding the trachea, it is a small organ with an upper and lower diameter of about 4 cm, a thickness of about 1 cm, and a weight of about 15g. The normal thyroid gland is soft and cannot be touched by hand from the outside, but when it is enlarged it can be touched by hand and can be seen in front of the neck, usually when the thyroid gland is enlarged. 2. What is the function of the thyroid gland: The thyroid gland uses iodine from food to synthesize “thyroid hormones” and release them into the bloodstream. Thyroid hormones have the function of promoting human growth and development and metabolism. In other words: to produce energy necessary for activities and to transmit a comfortable life. All are uses of hormones. Too much or too little thyroid hormone can cause deterioration of body regulation. The function of thyroid hormones: to enhance the activity of brain tissue, to regulate body temperature, to strengthen the activity of heart and stomach and intestines, and to promote metabolism. 3.How thyroid hormone keeps a certain amount: For the regulation of thyroid hormone, instructions are sent from the brain to the thyroid stimulating hormone TSH. TSH can sense the amount of thyroid hormone in the blood and can capture the subtle changes of the inverted thyroid hormone, thus keeping the amount of thyroid hormone in a certain range. 4. What are thyroid abnormalities: There are 3 types of thyroid abnormalities: 1) states with too much thyroid hormone (GD, etc.) 2) states with little thyroid hormone (Hashimoto’s disease, etc.) 3) states with enlarged thyroid gland (benign, malignant). “Thyroid hormones become more, thyroid hormones become less, some unpleasant symptoms appear throughout the body, unexplained state of poor body regulation and fatigue, etc., will continue to exist”. 5.What are the symptoms of abnormal thyroid hormone levels? The following 4 symptoms appear and are subject to blood tests: Symptoms of hyperthyroidism: 1, fatigue, lethargy 2, abnormal increase in sweating 3, fear of heat 4, increase in the number of pulses and palpitations 5, trembling of the hands and feet 6, enlarged thyroid gland 7, strong appetite 8, anxiety 9, itching 10, thirst 11, insomnia 12, persistent low fever 13, shortness of breath 14, hair loss 15, increased bowel movements 16, protruding eyes; Symptoms of hypothyroidism: 1, fatigue, lethargy 2, little sweating 3, fear of cold 4, reduced pulse number 5, swelling (face, body) 6, goiter 7, weight gain 8, lack of breath (refers to breathing) 9, dry skin 10, hoarseness of voice 11, drowsiness 12, forgetfulness 13, slow movement 14, Hair loss 15, constipation 16, lack of energy.