A thyroglossal cyst is a congenital cyst caused by incomplete degeneration of the thyroglossal duct due to congenital developmental abnormalities. The main clinical manifestation of a thyroglossal cyst is a mass under the lower jaw, in the anterior middle part of the neck, an oval-shaped mass that can move with tongue extension and swallowing movements, and a round cystic mass that can be easily touched. The thyroglossal cyst is prone to infection and local fistula formation, so after clinical diagnosis by ultrasound or CT and other clinical means, early surgery should be chosen to remove the lesion completely, and it will not reappear after removal.