I thought I had them because of low T as well (and really low estrogens). After all, that wasn’t the case, still have them with optimal numbers now. In the mean time, fixing sex hormones and cortisol unmasked hyperthyroidism from too much armour. My TSH was totally out of wack (way too high for my free levels) before fixing other hormones, now I have a suppressed TSH that matches my symptoms of hyper so I have to lower my dose, my hot flashes are a bit better already.
I think I’m about to find a good balance.
So you might have hot flashes from other causes too, just don’t forget to look at the whole picture.