Angina  is chest pain or discomfort that occurs when your heart muscle does not get enough blood.There are three types of angina.

1. Stable: Stable angina is the most common type. It occurs when the heart is working harder than usual. The pain usually goes away in a few minutes after you rest or take your angina medicine.

2. Unstable:  Unstable angina is a very dangerous condition that requires emergency treatment, it is a sign that a heart attack could occur soon.

3.Variant: Variant angina is rare. It usually occurs at rest. The pain can be severe and usually occurs between midnight and early morning. It is relieved by medicine.

If you have noticed a pain in your chest when you exert yourself, you should visit your doctor he will examine you. He will listen to your heart and chest, check your blood pressure, and look for any signs of anemia. You may need to have some further tests to help diagnose if you have a heart condition. These can include:

ECG (electrocardiogram), where your heart’s electrical activity is measured, either while you are lying down or exercising on a treadmill. Blood tests, such as a blood count, cholesterol and lipid levels, and cardiac enzymes (which are released by damaged heart cells).

Angina pain starts in the center of the chest, deep behind the breastbone, and may radiate to other parts of the body. Patients have said it feels like “An elephant sitting on my chest.”

It has happens when some part of the heart does not receive enough blood as the vessels that carry blood to the heart become narrowed and blocked.