evidence: Some people with Hashimoto thyroiditis have other endocrine disorders, such as diabetes, an underactive adrenal gland, or underactive parathyroid glands, and other autoimmune disorders, such as pernicious anemia, rheumatoid arthritis, Sjögren syndrome, or systemic lupus erythematosus (lupus). [...] Treatment of Hashimoto Thyroiditis [...] People with Hashimoto thyroiditis who are not taking thyroid hormone replacement should avoid high doses of iodine (which can cause hypothyroidism) from natural sources, such as kelp tablets and seaweed; however, iodized salt and iodine-fortified bread are allowed because they contain lower amounts of iodine.