Usually, early repolarization is not an emergency. It is a common ECG pattern, often seen in healthy young people, and is typically benign.

However, it can resemble ST-segment elevation from a heart attack. Seek emergency care now if there is chest pressure/pain, shortness of breath, sweating, fainting, palpitations, pain spreading to the arm/jaw/back, or a new abnormal ECG, especially with cardiac risk factors.

A clinician must interpret it in context and compare with prior ECGs. If it was found incidentally and you feel well, arrange routine follow-up rather than assuming it is dangerous.