There has been a huge increase in autoimmune diseases in recent years, mostly amongst women - according to this, 95% of those with hashimoto's are women. This is a look at the cutting edged of science in understanding why.
Admins, I know this is off topic, but there are a lot of people with autoimmune diseases here. Feel free to lock it from further discussion, but I hope you can leave it so others can follow the link and listen to it - and take it to more suitable forums to discuss, if they care to. I am not a member of those forums.
Disclaimer: I have never been diagnosed with an autoimmune condition (except eczema and asthma, which I am not sure count), but recently found out that they are increasing in a similar way to type 2 diabetes, so have started taking an interest in why.