The normal location of the thyroid gland is directly in front of the neck, below the thyroid cartilage and on either side of the trachea, i.e. 2-3 cm below the laryngeal node. The thyroid gland, which can be divided into the left lobe, the right lobe and the isthmus in the middle, resembles a butterfly and weighs about 20 to 25 grams. Because it is attached to the cricoid cartilage on the inside, the thyroid gland can move up and down with the throat during swallowing. For this reason, patients are often clinically instructed to swallow their saliva to determine if the neck mass is from the thyroid gland. The thyroid gland is the largest endocrine gland in adults, and the thyroid hormones it secretes play an important role in the synthesis and metabolism of various nutrients in the body, which can maintain the normal physiological activities of cells and tissues as well as the growth and development of the organism, and have a great impact on the development of bones and the nervous system in particular. Under normal circumstances, the thyroid gland is small and thin, and is difficult to see and touch. When there are lesions in the thyroid gland, such as nodules or enlargement of the thyroid gland, it often manifests itself as an enlarged neck or a lump in the neck. Attention should be paid to timely visit to the hospital, under the guidance of the physician to do thyroid palpation, ultrasound, function tests and other tests to clarify the diagnosis, and then targeted treatment.