Hypothyroidism is caused by what

Hypothyroidism can be caused due to a variety of reasons, these reasons can be divided into congenital and acquired two categories.
(1) of congenital reasons: ① thyroid not developed or stunted. ② because of congenital defects, resulting in thyroid hormone synthesis of some of the lack of the thyroid hormone synthesis in obstacles. ③ systemic many organizations thyroid hormone receptors, such thyroid hormone receptors can play a role. When the Organization of congenital causes of thyroid hormone receptor defects, although many of the thyroid hormone, also due to the receptor defects, thyroid hormone can not play a role, which have hypothyroidism performance.
(2) Acquired reasons: ① long-term iodine deficiency, thyroid hormone synthesis shortage of raw materials, thus reducing the production of thyroid hormones. ② thyroid surgery, it will be total removal of the thyroid, or the removal of the thyroid tissue excessive. Also can cause hypothyroidism. ③ 131 radioactive iodine treatment, excessive use of iodine 131, excessive thyroid tissue damage, and there may be hypothyroidism. ④ various thyroiditis caused thyroid tissue damage can cause hypothyroidism. ⑤ Some drugs can inhibit the production of thyroid hormones, resulting in hypothyroidism. Common drugs are anti-thyroid drugs. ⑥ hypothalamus - pituitary lesions due to lack of thyroid stimulating hormone, thyroid function of the thyroid hormone production reduced.