Should I be concerned? Treated for pap thyroid ca 2 mos ago, started synthroid (thyroxine). Always have had issues with trying to lose weight now easy to lose...

Synthroid (thyroxine) dose. After thyroid ca, the synthroid (thyroxine) dose is adjusted to suppress pituitary TSH (which stimulates thyroid ca). It may make you a little hyperthyroid, although it should not make you hyperthyroid to the point of tremor, nervousness, palpitations, etc. If your ft4 is normal, and you otherwise feel well, then the weight loss may be a welcome side effect. Talk to you doctor.