<human>: Can you succinctly summarize the text in 1-3 sentences?

So we all know that "butterflies in the stomach" feeling we get when we're about to do something exciting like go on stage, or when we have a new crush, or are about to head off on a long trip overseas, etc etc etc. I've tried to find out what physically causes it, but annoyingly all of the sources I've found only deal with the *psychological* causes - being nervous, excited, anticipating something, even having an anxiety disorder.

The thing is, I've been having this feeling on-and-off (near constantly once I'm aware of it) for the last two days or so. I love the feeling - I associate it with the adrenaline rush of being about to sing on stage, which I haven't done in a couple of months, or going out on a big night out where I know I might run into a crush, that kind of thing. I know many people find it unpleasant, but I find it *immensely* pleasurable because for me it's associated pretty much entirely with positive emotions and experiences.

The thing is, I don't tick *any* of the above boxes at the moment. I do not have and never have had an anxiety disorder of any kind. I have nothing particularly exciting coming up. I haven't got any big plans for the next couple of weeks, and really life is pretty chill and mundane at the moment.

So why might I be getting this feeling? As I say, I find it extremely enjoyable - it's like a wave of "it's about to go down, hold on tight!" which ripples from the bottom of my stomach upwards - but I just wonder is there a chance that it could be a symptom of something physically wrong and/or potentially dangerous? I'd love to just sit here and enjoy feeling excited and good-nervous for no reason, but obviously since it's unusual I'm just wondering if it could be an actual problem of some kind.

I have one theory about it, but I'd be interested in seeing people's ideas here before I introduce any potentially leading suggestions.
<bot>: feeling the anticipatory butterflies of an adrenaline rush all day, wondering what might be the cause of that and whether I can just sit back and enjoy it or whether I should worry about it.