<\/span><\/h3>\n1.Hashimoto\u2019s thyroiditis<\/b>-In this thyroid gland is usually enlarged and has a decreased ability to make thyroid hormones. It is an autoimmune disease in which the body\u2019s immune system inappropriately attacks the thyroid tissue.<\/p>\n
2.Lymphocytic thyroiditis<\/b>-In this inflammation is caused by a particular type of white blood cells.<\/p>\n
This condition is common after pregnancy.in these cases there is usually a hyperthyroid phase followed by a hypothyroid phase.<\/p>\n
3.Thyroid destruction secondary to radioactive iodine or surgery-<\/b><\/p>\n
Patients who have been treated for a hyperthyroid condition and received radioactive iodine may be left with little or no functioning thyroid issue after treatment.<\/p>\n
Removal of the thyroid gland during surgery will be followed by hypothyroidism.<\/p>\n
4.Pituitary or hypothalamic disease<\/b>-If for some reason the pituitary gland or hypothalamus are unable to signal the thyroid and instruct it to produce thyroid hormones, a decreased level of circulating T4 and T3 may result, even if the thyroid gland itself is normal. This is called \u201csecondary hypothyroidism\u201d.If the disease is due to hypothalamic disease, it is called \u201ctertiary hypothyroidism\u201d.<\/p>\n
5.Pituitary injury<\/b>-It may result after brain surgery or if there has been a decrease of blood supply to the area. In these cases, TSH hormone has become low, and hypothyroidism results because the thyroid gland is no longer stimulated by pituitary TSH.<\/p>\n
6.Medications<\/b>– Medicines that are used to an overactive thyroid may cause hypothyroidism. These include Methimazole, Propylthiouracil etc.<\/p>\n
7.Severe iodine deficiency<\/b>-In areas of world where there is an iodine deficiency in the diet severe hypothyroidism can be seen.<\/p>\n