Emotions, hormones, cortisol, etc. What an amazing job the thyroid does. Hashimoto's is indicative to periods of both hyperthyroid and hypothyroid. That's what makes it so difficult to treat. There is no cure for Hashimoto's Disease. Only treatment. Which is kind of like taking cold medicine for the flu. Sure, it will help a little bit, but the disease never gets better. It lasts until death.