Cardiology Questions Answered by Verified Cardiologists.
Younger individuals who have sudden onset of rapid heart rates that last for varying lengths of time and then stop abruptly may have tachycardias that often start in the atrium or upper chamber of the heart. This would be different than a few isolated skipped beats here and there as the mechanisms are different. However it could be a number of other things too.
It would be very important to have these events documented by one of several monitoring devices to get a definitive diagnosis. People with intermittent atrial tachycardia will often say it starts and stops suddenly; like slamming off an alarm clock.
The fact that it is associated with sweating suggests this might be what is going on. Diagnosis is important because some of these types of arrhythmia are treatable depending on what it is, how pernicious it is and how fast it goes. The ones that are set up little "short circuits" can be cured by ablation. Other ones may respond to medications. Nothing definitive can be offered until the problem is identified by EKG or heart monitoring.