Caused by coronary heart disease. Angina is chest discomfort triggered by walking. Anger and anxiety can also trigger Angina. Men tend to experience this during physical activity while women experience Angina at rest. There are different grades of Angina – stable and unstable. Stable is the most common and is called stable as there are key triggers that cause Angina and can be avoided. Unstable can range from mild to a heart attack. Often requires hospitalization. Treated with medications and very often it is treated with bypass surgery.