In the early stages, people with heart failure might not be aware of any symptoms. But as it progresses, one or more of the following symptoms may begin to appear:
Shortness of breath (dyspnea) - A feeling of breathlessness, as if you can't get enough air, may come on during physical activity. In more advanced heart failure, shortness of breath occurs at rest or can awaken patients from sleep. Propping yourself up with extra pillows may help you breathe more easily at night.
Fatigue - Activities that did not feel strenuous to you before, such as walking or climbing stairs, may easily tire you out. You may even feel exhausted while resting, when you haven't been active at all.
Chronic coughing or wheezing - Fluid congestion (a buildup of fluid in the lungs) is common with heart failure, and is the reason why doctors often refer to it as "congestive heart failure" (CHF). This congestion can make you wheeze and cough. Some people cough up mucous or phlegm.
Fluid retention or swelling - Fluid also can build up in other parts of your body, such as your feet, ankles, legs, and abdomen. Swelling, or edema, is the most obvious sign of fluid buildup, but weight gain also may be a signal. This fluid buildup in the abdomen makes some people lose their appetite or feel nauseated.
Rapid or irregular heartbeat - Your weakened heart may try to beat faster to send more blood through your system, making you feel like your heart is racing. Or it may trigger an arrhythmia, which can cause palpitations, heart pounding, or other symptoms.
Confusion - The reduced blood flow to your brain may cause feelings of confusion, impaired thinking, or mental sluggishness.
