strangely they also are common with estrogen dominance
You must get them with both Hypo/Hyper..i have had them for 24 years been both Hyper /Hypo..now Hypo and still get them:(
Are you already on thyroid hormone replacement medication?
I seem to get heart palps in the evening if my Free T3 is to high or too low. Or after a thyroid med dose change.
I have Hashimoto hypOthyroid.
Most people who suffer from Hyperthyroidism get the palpitations, that is not to say some who are hypo don't also get them.
TSH, Free T3, Free T4 and antibodies are the standard tests for thyroid function.
Also ask for Vit D, Calcium and Iron studies, as these too can give heart palpitations if the levels are down.
Post your results back here and we can guide you.
Cheers