I have had Palpitations since my teens, still get them on the meds for Hypo..I have a goiter and 4mm nodual, was told my goiter would be from having Hashi for so long not dx and ended up with a goiter as i went into sever Hypo and Myexedema.I know tho having read that a goiter does go mostly with Hyper..
I can be sitting in a chair reading a book and my heart rate will jump to 102 - 110 beats a minute...I'm hypo....I don't know if you are on meds...check your little sheet that comes with...I'm on synthroid and it says right in the packet that it can cause tachycardia and some arrythmias....