Yes, stress can cause abnormal ECG results. When a person is stressed, their body releases stress hormones like adrenaline, which can affect the electrical activity of the heart and cause changes in the ECG reading. These changes can include: Increased heart rate: Stress can cause the heart to beat faster, which can be reflected in the ECG as a higher heart rate. Arrhythmias: Stress can trigger abnormal heart rhythms such as premature ventricular contractions (PVCs) or supraventricular tachycardia (SVT). ST-segment depression: Stress-induced changes in the blood vessels can reduce the blood supply to the heart, leading to ischemia and ST-segment depression on the ECG.