Uncommon causes of
hyperthyroidism or too much thyroid hormone in the
Taking too much thyroid hormone medicine. This can happen if you
are taking thyroid hormone to treat thyroid cancer. It can also happen if you
take too much thyroid hormone in an attempt to lose weight.
large amounts of substances or medicines that contain iodine, such as iodized
salt, kelp, cough syrups, multivitamins, or certain medicines, such as
amiodarone, lithium, and interferon alfa.
Having too much thyroid
hormone after pregnancy.
A growth in the uterus that releases
hormones into a woman's body, causing the thyroid to produce too much thyroid
A rare tumour that grows on a woman's
ovaries. The tumour contains thyroid tissue, which
releases thyroid hormone into the body.
A rare tumour on the
pituitary gland located in your brain. This tumour
causes the pituitary gland to make too much thyroid-stimulating hormone (TSH).
TSH stimulates the thyroid gland to make more thyroid hormones.
Stress, surgery, or using contrast materials containing iodine for
CT scan or radioactive iodine therapy.
The thyroid gland usually returns to normal after treatment. For
example, after you quit taking substances that contain large amounts of iodine
or after a hormone-producing tumour is removed, the thyroid gland again works