This study used ECG-EEG correlation analysis to examine how physical and psychological stress affects the heart and brain. Controlled stress-inducing activities included rigorous physical exertion and difficult mental demands. ECG and EEG signals were recorded during stressful tasks. The study found diverse physiological and brain responses to physical and mental stress. Intense exercise caused heart arousal and sympathetic activation in the participants. Heart rate, blood pressure, and ECG waveform characteristics rose. An electroencephalograph (EEG) showed increased beta and gamma band activity, indicating cognitive engagement and attentional concentration.Psychological stress tests, which involve cognitive issues and mental stress, caused varied heart and brain responses. ECG-derived emotional regulation and autonomic control indices and heart rate variability increased. Alpha and theta band activity in the patient's EEG showed cognitive and emotional changes.The study also showed significant relationships between cardiac and brain measures, revealing how stress affects the cardiovascular and central neurological systems. Some ECG characteristics correlated with EEG frequency bands, suggesting a link between heart activity and mental oscillations