What is a heart attack?
A heart attack occurs
when blood flow to the heart is blocked. Without blood and the oxygen it
carries, part of the heart starts to die. A heart attack doesn't have to be
deadly. Quick treatment can restore blood flow to the heart and save your
Your doctor might call a heart attack a myocardial
infarction, or MI. Your doctor might also use the term
acute coronary syndrome for your heart attack or
What is angina, and why is unstable angina a concern?
Angina (say "ANN-juh-nuh" or "ann-JY-nuh") is a type of chest pain or
discomfort that occurs when there is not enough blood flow to the heart. Angina
can be dangerous. So it is important to pay attention to your symptoms, know what
is typical for you, learn how to control it, and know when to call for help.
Symptoms of angina include chest pain or pressure, or a strange feeling in the chest. Some people feel pain, pressure, or a strange feeling in the back, neck, jaw, or upper belly, or in one or both shoulders or arms.
There are two types of angina:
- Stable angina has a typical
pattern. You can likely predict when it will happen. It happens when your heart is working harder and needs more oxygen,
such as during exercise. Your symptoms go away when you rest.
- Unstable angina is unexpected, and
resting or taking nitroglycerin may not help. Your doctor will probably
diagnose unstable angina if you are having symptoms for the first time or if
your symptoms are getting worse, lasting longer, happening more often, or happening
Unstable angina is a warning sign that a heart attack may
happen soon, so it requires treatment right away. But if you have any symptoms of angina, see your doctor.
What causes a heart attack?
Heart attacks happen
when blood flow to the heart is blocked. This usually occurs because fatty
plaque have built up inside the
coronary arteries, which supply blood to the heart. If a plaque breaks open, the
body tries to fix it by forming a clot around it. The clot can block the
artery , preventing the flow of blood and oxygen to the heart.
This process of plaque buildup in
the coronary arteries is called coronary artery disease, or CAD. In many
people, plaque begins to form in childhood and gradually builds up over a
lifetime. Plaque deposits may limit blood flow to the heart and cause angina.
But too often, a heart attack is the first sign of CAD.
like intense exercise, sudden strong emotion, or illegal drug use (such as a
stimulant, like cocaine) can trigger a heart attack. But in many cases, there
is no clear reason why heart attacks occur when they do.