Simple goiter refers to enlargement of the thyroid gland with normal thyroid function, mostly caused by iodine deficiency or other abnormalities that lead to thyroid hormone synthesis, which is a compensatory goiter, and the main clinical manifestation is enlargement of the thyroid gland or a lump in the neck. When the enlargement of the thyroid gland is not very serious, there can be no compression symptoms, but if the enlargement is very prominent, it can compress the organs around the thyroid gland, such as compression of the trachea leading to respiratory difficulties, can also compress the esophagus to cause dysphagia or swallowing difficulties, but also compress the recurrent laryngeal nerve leading to paralysis of the vocal cords, hoarseness, and also compress blood vessels and other parts of the nerves leading to corresponding symptoms. The symptoms of the disease can also be seen in other parts of the body.