Hyperthyroidism may lead to neck thickening. Because the main pathogenesis of hyperthyroidism is that the thyroid hormone secretion in the body is higher than normal, and if the thyroid gland of the patient wants to secrete more thyroid hormone, it will make thyroid related cells proliferate or hypertrophy. At this time, it may cause the neck of the patient to thicken, so if the neck may thicken after anti hyperthyroidism treatment, It cannot return to the original state, because if anti hyperthyroidism drugs are used, the hypertrophic thyroid related cells can become normal, but the hypertrophic thyroid related cells cannot be removed.