Hyperthyroidism can be primary, secondary and tertiary:
In the case of primary hyperthyroidism, the cause of hyperthyroidism is thyroid: the gland captures too much iodine, and will produce an excess of thyroid hormones.
In the case of secondary hyperthyroidism, the cause is located upstream of the thyroid, in the pituitary gland (small gland at the base of the brain).
Finally, tertiary hyperthyroidism is due to excess secretion of TRH from the hypothalamus, which in turn stimulates the pituitary gland and thyroid.
Here are the different causes of primary hyperthyroidism:
- An overall hypersecretion of the entire gland. This is the case of hypersecreting thyroid goiters, such as Graves' disease.
Graves' disease is an autoimmune disorder. The affected organism secretes antibodies against its own thyroid: the result is a thyroid that is racing, despite messages from the pituitary, and secretes too much hormone. We are then in front of hyperthyroidism.
- The presence of one or more thyroid nodules: this is the case of cysts, adenomas or even thyroid cancers.
- Acute inflammation of the thyroid, caused by an infection or autoimmune disease, which can give signs of hyperthyroidism.
- Overload of iodine: weight loss products based on thyroid extracts, taking too much thyroid hormone, drugs with iodine, etc.
Read also :
> All about goiter
> Iodine: an essential trace element