Palpitations and arrhythmias

I’M not really an anxious person. In fact, I don’t even get scared when I watch horror movies with my boyfriend. But recently, my heart has been beating fast for no reason at all. My boyfriend says I’m having palpitations. What are palpitations? 

Palpitations are what happens when you have an increased awareness of your own heartbeat. This can be a normal heartbeat, like when you are exerting yourself during exercise, or when you are anxious or excited about something.