Thyroid cysts refer to fluid-containing sacs that appear in the thyroid gland. Generally, these cysts do not become malignant, and they do not present any clinical symptoms, nor do they cause hyperthyroidism. If the cyst is particularly large and compresses the local thyroid tissue, it generally does not lead to hypothyroidism. Therefore, there is generally no need for a special diet for thyroid cysts. However, some scholars believe that the formation of thyroid cysts is related to iodine deficiency, or they can also occur in areas with high iodine content. Hence, it is advisable to avoid consuming foods with particularly high iodine content.