Does your heart flutter sometimes? Do you always feel really tired? Most people have had heart palpitations, been lightheaded, or felt short of breath at one time or another. Sometimes, a little chest discomfort is nothing to worry about - but sometimes, these symptoms can be signs of serious, life-threatening heart problems. Learn about the signs and symptoms of six major heart problems below, so that you can stop them in time. You can learn more about your risk factors for heart issues by visiting a free heart screening.