Secondary hypo is when your pituitary is not producing enough TSH to stimulate
your thyroid to produce T3 and T4, the two primary
thyroid hormones. So, technically,
your thyroid should be capable of producing thyroid hormones, but your pituitary is not stimulating it to do so. However, the result is that you are hypothyroid since your T3 and T4 levels are inadequate. I hope that's not too confusing.
It is not Hashi's, although you might also have Hashi's...once again...