Mixed density nodules in the thyroid gland are more likely to be benign, but some nodules usually have bleeding within the lesion and appear as cystic lesions. The cause of thyroid nodules is related to the structure of the diet, mainly due to iodine deficiency in the food, which stimulates the thyroid follicles to proliferate to varying degrees, resulting in the formation of nodules. Multiple nodules are also prone to liquefaction and cystic changes within the nodule, and even enlarged nodules may compress the trachea and adjacent esophagus, causing coughing, coughing, choking after eating, or significant retrosternal discomfort and gas pressure. Multiple thyroid nodules are also prone to secondary hyperthyroidism, and should be treated systematically. In addition to adjusting the diet, regular laboratory tests should be performed, mainly for thyroid function measurements and color ultrasound of the thyroid gland, as some nodules are prone to recurrence after surgery.