You should not eat kelp for thyroid nodules caused by high iodine, and you can eat kelp for thyroid nodules caused by low iodine. Thyroid nodules are a very common disease that refers to abnormal growth of local thyroid cells, resulting in one or more abnormal tissue structure masses in the thyroid gland. There are many causes of thyroid nodules, such as too much or too little iodine. Whether or not you can eat kelp with thyroid nodules, you must first identify the cause of thyroid nodules, whether it is caused by too much iodine. After examination, urinary iodine is greater than 800ug/dL and the iodine-131 rate is low, less than 10% for 24 hours, which is a thyroid nodule caused by too much iodine. In this case, you should not eat kelp because it contains more iodine, which will promote the growth of thyroid nodules. If the thyroid nodules are not caused by high iodine and the thyroid nodules are caused by low iodine, it is possible to eat kelp for thyroid nodules.