Heart failure is a serious condition, but its name can be misleading. It does not mean that the heart has suddenly stopped; instead, the heart is unable to pump blood well enough to meet the body’s needs, or it can do so only when pressure inside the heart becomes unusually high.
Millions of people live with heart failure, and the condition becomes more common with age. It can develop after heart damage from problems such as coronary artery disease, a previous heart attack, long-term high blood pressure or certain heart valve problems.
Heart failure can affect the left side, right side or both sides of the heart. Symptoms vary from person to person, and they may develop slowly over months or appear more quickly when the condition suddenly becomes worse.
Shortness of breath is one of the most common warning signs. It may first appear during exercise or everyday activities, but as heart failure becomes more severe, some people become breathless while resting or lying flat.
This happens partly because the heart has difficulty moving blood forward efficiently. Pressure can then build up behind the heart, allowing fluid to collect in the lungs and making breathing more difficult.
Swelling in the feet, ankles and legs is another common sign. When blood circulation is poor and the kidneys hold on to extra salt and water, fluid can collect in body tissues and cause noticeable swelling.
A sudden increase in body weight can also signal fluid buildup. For someone already diagnosed with heart failure, an unexpected weight increase over a short period may be an important sign that the condition is getting worse.
Extreme tiredness can be another clue. When the heart cannot supply enough blood to muscles and other tissues, ordinary activities such as walking, climbing stairs or shopping may become much more exhausting than they once were.
Some people develop a persistent cough or wheezing, particularly when lying down. Fluid in the lungs can contribute to these symptoms, and coughing up pink or blood-tinged foamy material can be a sign of a medical emergency.
A fast, pounding or irregular heartbeat may also occur. The heart may beat faster as it tries to maintain blood flow, while some people with heart failure also have abnormal heart rhythms such as atrial fibrillation.
Heart failure can sometimes cause symptoms that do not immediately seem connected to the heart. Reduced appetite, nausea or a feeling of fullness can occur when blood flow to the digestive system changes or fluid builds up around the abdomen.
In more advanced illness, some people may become confused, have difficulty concentrating or seem unusually sleepy. These changes can have many causes, but sudden confusion—especially with severe breathing problems or chest pain—needs urgent medical attention.
Research and clinical guidance published by organizations such as the American Heart Association and the European Society of Cardiology show that recognizing symptoms and treating heart failure early can improve quality of life and reduce hospital admissions. Modern treatment may include several types of medicines, lifestyle changes and, for some patients, implanted devices or surgery.
People who already have heart failure may be advised to watch their symptoms, weight and swelling closely. A clear change from their normal pattern can help doctors identify worsening fluid buildup and adjust treatment before hospitalization becomes necessary.
Many heart failure symptoms can also be caused by other conditions, so symptoms alone cannot confirm the diagnosis. However, new or worsening breathlessness, persistent swelling, rapid unexplained weight gain or severe fatigue should be discussed with a healthcare professional, while sudden severe breathing difficulty, fainting or chest pain requires emergency care.
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