Thyroglossal cysts are most commonly seen in children aged 1-10 years, but can also be seen in adults. The cause is due to a congenital developmental defect. The preferred site of the cyst is the midline of the neck, sometimes slightly to one side. The cysts are slow growing, round, soft, well circumscribed, and not adherent to the surface skin and surrounding tissues. If the cyst is located below the hyoid bone, tough cords can be found adhering to the body of the hyoid bone, so it can move with swallowing and tongue extension, etc. The patient usually has no discomfort. The cyst can become infected by communicating with the oral cavity through the blind foramen of the tongue, resulting in a large collection of pus that can cause the cyst to rupture and form a thyroglossal fistula. If left untreated for a long time, the thyroglossal fistula may become cancerous. The treatment of thyroglossal cysts is mostly surgical, and the key to surgery is that in addition to removing the cyst, the middle part of the hyoid bone should be removed together, otherwise it may recur.