It’s a "chicken or egg" question. Does stress cause autoimmune thyroid disease, or does having an autoimmune thyroid condition like Hashimoto’s or Graves’ disease cause stress? The answer? Both are true. Stress is associated with the onset of autoimmune conditions but stress can also make your thyroid disease and related symptoms more problematic. Research shows that stress is associated with a number of negative health effects. Here are 13 ways stress makes thyroid disease worse.