Heart & circulation

Your heart and blood vessels move oxygen to every part of your body, so when circulation falters the whole system feels it. This section covers conditions of the heart and vessels, from angina and heart attack to stroke and high blood pressure. Learn the symptoms that call for immediate help, such as chest pressure, sudden weakness on one side, or breathlessness, and understand the risk factors you can change: blood pressure, cholesterol, smoking, and how active you are. Many heart problems build quietly over years, which is why knowing the early signs matters. If chest pain is severe or comes with sweating or nausea, call 911.