Angina is a medical condition marked by chest pains caused by reduced blood flow to the heart. It is usually caused by coronary artery disease, and can be triggered by physical exertion or emotional stress. Symptoms of angina include chest pain, tightness, and pressure, as well as shortness of breath, nausea, and fatigue. Treatment for angina typically includes lifestyle changes, such as quitting smoking and exercising regularly, as well as medications and, in some cases, surgery.