If your heart hurts when you exercise, it is likely that angina is occurring. Angina occurs due to narrowing of the lumen caused by atherosclerosis of the coronary arteries, thus causing ischemia and hypoxia in the myocardium under increased cardiac load. Patients with coronary heart disease have angina because exercise causes an increase in the load on the heart and the narrowed coronary arteries cannot increase the adequate local blood supply, causing temporary ischemia and hypoxia to occur in the myocardium. Patients whose heart hurts when they exercise should go to the hospital as soon as possible to improve electrocardiogram, exercise test, CT coronary artery imaging and other related examinations, and if necessary, coronary angiography to clarify the condition of coronary artery lesions. Standardized treatment needs to be given in time to avoid serious cardiovascular events.