title: I understand why someone with an underactive thyroid would be fatigued, but I was diagnosed with an overactive thyroid and fatigue was my main symptom.  How could I be fatigued if I have too much thyroid hormone in my system?
mesh_terms: D005221:Fatigue / Q000209:etiology*; D006801:Humans; D006980:Hyperthyroidism / Q000150:complications* / Q000503:physiopathology