Are heart palpitations dangerous?

Depends. There are a variety of palpitations some dangerous some not. I may have just answered another question that could have been yours as well. The cardiologist will look at what arrythmia ( palpitation) you have and that will determine if its dangerous or not. Its important if you are having them to see a cardiologist have a halter to monitor your heart ekg for a few days and find out what you have.