Is there any other diease that could be mistaken for graves disease?

Graves diagnosis: Graves hyperthyroidism typically involves heat intolerance, tachycardia, palpitations, tremor, irritability, etc. Many other things can cause these symptoms, eg. Anxiety. With graves there is typically a goiter, elevated ft4 or t3, (liothyronine) low tsh, increased radioactive iodine uptake. Combine the symptoms with the labs, and there is not much else that can do this, except a very rare pituitary tsh-oma.