There are a few things that can happen to a shivering heart, 1. Shivering once, or twice, is shivering, or occasionally shivering, this time of year it could be a premature ventricular contraction of a heart arrhythmia. Premature ventricular contractions are the most common arrhythmia and most people have them, either early, late, or when they are asleep and when they are active. If your heart shivers when you are active, consider whether there is myocardial ischemia. If you shiver when you are sleeping and lying quietly, it may be caused by neurological factors. When shivering, you must do an electrocardiogram (ECG), and if you can’t catch it in the short term, you need to do a long term one.2. There is also a kind of total shivering, non-stop shivering, which is most likely to be the ventricular premature beats, dysthymia, ternary rhythms in arrhythmia, a normal one is abnormal, and a normal one is abnormal. Another possibility is atrial fibrillation, more need to do an electrocardiogram, to confirm the diagnosis of what it is, and then targeted treatment.