Palpitations vs arythmia

That's a great question. I've noticed both are thrown about in all situations. Gloaming, I need a clarification of terms -- something you are great at doing.

I cannot be certain, not unless I saw an ECG running concurrently, but in my experience, limited to my own body and what I have gleaned from reading widely in health forums, they are one and the same.
Palpitations are a symptom. The term is accepted by the medical establishment as one that patients seem to like to use, but it isn't a diagnosis...it LEADS to a diagnosis. It is just a symptom. The 'cause' is likely to be a pounding heart, a reaction to adrenalin, or it really is an arrhythmia, but also caused by adrenalin. That is why those with atrial fibrillation (AF) are often given a B-adrenergic (a 'beta-adrenergic') which is meant, not to suppress the production of an overactive and fearful brain of adrenaline (through the pathway from the amygdala, the brain's fear center, on down through the pituitary gland and thence to the adrenal glands atop each kidney), but to quell the heart's intended reaction to the adrenalin when the blood carries the hormone as far as the heart muscles and they react with the pounding. Long sentence...sorry. Maybe read it again, aloud if it will help.
So, about palpitations and AF....they're either the heart pounding in reaction to the stress hormone, in which case it is still NSR (normal sinus rhythm) and still scares the bejaysus out of us, or it is a stress reaction where the heart breaks into AF, which is one of the several 'supra-ventricular' tachycardias, meaning 'above the ventricles.'
Very concisely, palpitations = symptom, arrhythmia = actually defective rhythm (which may or may not be symptomatic...some never sense their AF or flutter).

That was well-explained, thanks.
I have heard it said that the palpitation is how your brain perceives what your heart is doing. It's what you feel and how you feel about it. What the heart muscle is actually doing. e.g arrhythmia, is measureable; a palpitation is not.