A heart attack (myocardial infarction or MI) is a serious medical emergency in which the supply of blood to the heart is suddenly blocked, usually by a blood clot.
Our Health A-Z contains more information on Heart attack.
Pericarditis is inflammation (swelling) of the pericardium, which is the fluid-filled sac surrounding your heart.
Our Health A-Z contains more information on Pericarditis.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.