Why can't people accept the most likely reason (hypothyroidism)?
You are probably right. But the Hillary campaign should get that all out there. And why did her meds fail her?
Hello, hypothyroid woman here.
The meds actually are what make you more susceptible to heat, so this is probably on them. It's one of the most common side-effects. They make your internal organs much more happy, but the downside is less tolerance for heat. EDIT:
http://www.rxlist.com/armour-thyroid-side-effects-drug-center.htm This actually lists the heat sensitivity as a "severe reaction" rather than common side effect, but uh, all the information I've gotten over the years lists heat sensitivity as a common side effect and the doctors and pharmacists just suggest avoiding long stints in the sun, because heat sensitivity is common with thyroid meds.
As a 30 year old woman who can't stand long periods out in the sun without some relief, I'm really impressed by her stamina. She definitely just needed some rest. As for being fit to be president, as long as she doesn't have to go lead from the front in some war, I think she'll be just as fine as anyone else her age. So, yeah, she's fine.