As I said before..I feel that the hormonal imbalances in our body are triggered by our intake of food and/or our environmental exposures. These things can also lead to inflammation in the body...and or hormonal imbalance...I do feel that excessive inflammation in the body can cause the immune system to go haywire...leading it to attack the cell tissues...such as the tissue of the thyroid... Interesting enough...this seems to cause the thyroid to either overreact or underact. Iodine is a micro nutrient that apparently have a huge impact on the thyroid... So, this is also another cause for thyroid issues. Iodine deficiency can cause a under active thyroid and too much iodine can cause a over active thyroid... This takes us back to our diet...lack of vital nutrients.
Below, you will find some links that may also assist you in your research for answers.
Here is a link for Hashimoto Disease https://www.niddk.nih.gov/health-information/endocrine-diseases/hashimotos-disease. Notice in this article it says Hashimotos appears in teen and young women. It more often appears in women between the age of 40 and 60. And it is 8 times more common in women than men.
Here is a link for Graves Disease...https://www.niddk.nih.gov/health-information/endocrine-diseases/graves-disease.
You can test your iodine level at home by doing a patch test on your skin...if you are interested...here is a link https://www.healthline.com/health/iodine-deficiency.
I do hope this is helpful...in your search about these diseases.
Pat.
