The number one cause of hypothyroidism is the thyroid autoimmune disease Hashimoto’s. The majority of my Hypothyroid Mom readers have Hashimoto’s, but most do not know it. The thyroid antibodies for Hashimoto’s (Thyroid Peroxidase Antibodies & Thyroglobulin Antibodies) are often not tested in mainstream medicine. Even when thyroid antibodies are tested and a patient is diagnosed with Hashimoto’s, the only treatment by mainstream medicine is thyroid hormone replacement medication. Hashimoto’s is more than a thyroid condition, it is an autoimmune disease. The underlying cause(s) of Hashimoto’s will vary for each patient and healing happens when the cause of that person’s Hashimoto’s is discovered.