 When it goes hypo, which means it runs low. And with Hashimoto's, it can swing back and forth. But if it goes really low, then you've got to use medication like Synthroid, Levothyroxine. You can use Armor, Westhroid. There's a lot of different versions of that you can use, depending on what the physicians will lead toward you. But, I mean, it just depends on what your doctor wants to do.