Thyroid cysts generally do not show any symptoms clinically and are mostly benign. They are usually solitary, but occasionally multiple cysts could be present. Currently, the exact cause of thyroid cysts is not completely understood. Some scholars believe that the formation of thyroid cysts is related to iodine deficiency. Others suggest that in areas with a high incidence of thyroid cysts, the iodine content is also relatively high, indicating that both exceptionally low or high levels of iodine could potentially be a cause of thyroid cysts. Seaweed is a food high in iodine. Eating seaweed occasionally should not have a significant impact, but consuming seaweed daily could lead to excessive iodine levels in the body, which is not advisable during periods of thyroid cyst affliction.