The thyroid gland is located in the anterior part of the neck, on either side of the anterior thyroid cartilage, slightly below the laryngeal node, immediately on either side of the bone that projects from the laryngeal node. The thyroid gland is the largest gland in the body with specific endocrine functions and produces thyroid hormones including thyroxine and triiodothyronine. Thyroid hormones play an important role in cell differentiation during growth and development, and in the regulation of many homeostatic functions of the body, including energy and heat production. The normal thyroid gland is located in the neck, anterior to the trachea, between the cricoid cartilage and the suprasternal notch, with the left and right lateral lobes connected by a thin isthmus. The thyroid gland is fixed to the trachea and the cricoid cartilage by the suspensory ligament of the thyroid gland and the lateral ligament of the thyroid gland. Therefore, the thyroid gland moves up and down with the swallowing movement, which is the basis for identifying whether the neck mass is related to the thyroid gland in the clinic. Normal thyroid gland is usually not felt when touching, if the enlarged thyroid gland is felt in the front of the neck on both sides of the laryngeal nodes and accompanied by pain, then it indicates that the thyroid gland may be inflamed, and need to be endocrinologists to do ultrasound of the thyroid gland, thyroid function, blood sedimentation, etc. to make a clear diagnosis.