Hashimoto’s is an autoimmune disorder. Autoimmune diseases  happen when the immune system begins attacking the body. In  Hashimoto’s, lymphocytes begin accumulating in the thyroid gland which causes damage. The lymphocytes create antibodies that begin damaging thyroid cells and destroying them. As more and more cells are destroyed, the thyroid gland can no longer keep up with the demands of the body.

• Sex – Adult females are at an increased risk of developing Hashimoto’s thyroiditis.
• Age – Typically, Hashimoto’s disease is diagnosed during middle age; however, it can also occur at any age.
• Other Autoimmune Diseases – Individuals who have an autoimmune disease are at an increased risk of developing other autoimmune disorders. Therefore, if you have another autoimmune disorder like rheumatoid arthritis, lupus, type 1 diabetes, pernicious anemia, or multiple sclerosis, you are at an increased risk of developing Hashimoto’s thyroiditis.
• Heredity – Genetics can also increase the risk of Hashimoto’s. Individuals with family members who have been diagnosed with Hashimoto’s thyroiditis are at an increased risk of developing this autoimmune disease.
• Other Factors – Several non-genetic factors can increase your risk. These include hormonal changes, viral infections, and certain medications. Those who eat large amounts of meat, consume excess iodine, or have been exposed to ionizing radiation are also at an increased risk of developing Hashimoto’s thyroiditis.