When your heart feels like it's jumping around, skipping beats, or fluttering, doctors call that palpitations. If you are experiencing palpitations, you may worry that you are going to have a heart attack. The good news is that the vast majority of the time, early or skipped heart beats cause nothing more than the simple sensation of a heart hiccup. They are not dangerous, and do not lead to additional problems. (Of course, you need to check with your doctor about your symptoms to be sure you are not in the percentage that has a truly concerning arrhythmia, but be reassured this is uncommon.)
Now, if your heart hiccups are also associated with increasing shortness of breath or trouble exercising, that's a different ball game, so head to your doctor now to be checked out.
Heart attack symptoms rarely involve any type of flipping sensations. Palpitations most often occur without any other types of discomfort and may occur in healthy young people as well as those medically challenged.