The thick neck is usually seen in the following cases: 1. Normal condition: normal people can also appear, related to their body shape, with a thicker and shorter neck. 2. Tumors in the neck, such as lipoma, hemangioma, cystic lymphadenoma, etc., which are usually asymmetrical in size, can be diagnosed by ultrasound, and if the tumor is thicker and compresses the nerves and blood vessels, surgery is usually required. 3. It is usually caused by insufficient iodine intake, and can be clearly diagnosed by ultrasound and nail function tests.