A little pain in the heart is seen clinically in the following diseases: 1. Insufficient blood supply to the heart in coronary artery disease. Most of these patients start with activity and can be relieved by rest or application of drugs such as nitroglycerin. examination of electrocardiogram and cardiac ultrasound helps to clarify the diagnosis. 2. myocardial diseases. The most common is hypertrophic obstructive cardiomyopathy, also prone to this chest pain performance, examination of cardiac ultrasound can help clarify the diagnosis. 3, aortic stenosis. As aortic stenosis affects the blood supply to the heart, angina is also a symptom that can be relieved by rest or nitroglycerin. 4, reflux esophagitis. This disease can also manifest itself as pain in the heart due to irritation of the esophagus by regurgitated material in the stomach, and a barium meal examination of the digestive tract can help clarify the diagnosis.