A thyroglossal cyst is usually a round mass of 1 – 2 cm in diameter. Most of the masses are located in the midline of the neck, a few can be slightly to one side, with clear margins, and often the masses feel substantial due to the filling tension of the intracapsular secretions. The mass can move up and down with tongue extension movement, which is its characteristic. In cases without infection, the cyst does not adhere to the skin, there is no pressure pain, and it does not affect the swallowing movement. When the cyst is infected, it shows pain, pressure and redness of the skin, and purulent secretions flow when it breaks outward, and later a sinus tract is formed between the cyst and the skin. The fistula may heal temporarily after a certain period of time, but soon afterwards it breaks down again on its own, so that it can heal repeatedly over the years and break down at times. After the diagnosis of a thyroglossal cyst is established, surgical removal should be sought before infection occurs. Cysts without infection can be operated on after the age of 2 years because the tip of the cyst is connected to the hyoid bone and the fistula mostly passes through the central part of the hyoid bone. 1 cm of the middle part of the hyoid bone should be removed during surgery so as to avoid recurrence of the fistula due to the remnants of tiny branches.