Causes of Hypothyroidism

Autoimmune diseases

-attacks the tissue of the thyroid 

-antibodies affect thyroid's ability to produce hormones 

Thyroid Surgery

-lost of the thyroid completely halts/slows production of the thyroid hormones 

-in this case need to take medications for rest of life

Iodine deficiencies

-thyroid needs iodine salts to make hormones, so if not enough iodine salts hormones can not be produces