Heart failure is one of the most common – and most misunderstood – heart conditions. The name sounds frightening, but it does not mean the heart has stopped or is about to stop. It means the heart isn’t pumping as well as it should, so the body doesn’t get all the blood and oxygen it needs. With today’s treatments, many people with heart failure feel better, stay out of the hospital, and live longer. This guide explains what heart failure is, how it develops, the warning signs to watch for, and how it’s treated.

What is heart failure?

Heart failure is a chronic, progressive condition in which the heart can’t pump enough blood to meet the body’s needs. This happens either because the heart muscle has become too weak to contract forcefully, or too stiff to fill properly between beats. When the heart can’t keep up, fluid backs up into the lungs, legs, and abdomen – which is why swelling and breathlessness are such common symptoms.

Types of heart failure

Doctors describe heart failure partly by the ejection fraction (EF) – the percentage of blood the main pumping chamber squeezes out with each beat (normal is roughly 50-70%):

  • Reduced ejection fraction (HFrEF) – EF of 40% or lower; the “weak pump” type.
  • Mildly reduced ejection fraction (HFmrEF) – EF of 41-49%.
  • Preserved ejection fraction (HFpEF) – EF of 50% or higher; the heart pumps normally but is stiff and fills poorly.

How does heart failure develop?

Heart failure usually develops when another condition damages or overworks the heart over time. A heart attack can kill heart muscle and weaken the pump. Years of high blood pressure force the heart to work harder, causing it to thicken and stiffen. Damaged valves, abnormal heart rhythms such as atrial fibrillation, and diseases of the heart muscle (cardiomyopathies) can all gradually impair function. The body compensates for a while, but eventually those mechanisms fall short and symptoms appear.

What are the risk factors and causes?

  • Coronary artery disease and prior heart attack – a leading cause.
  • High blood pressure
  • Diabetes
  • Obesity
  • Heart valve disease and congenital heart conditions
  • Cardiomyopathy (including genetic, alcohol-related, and chemotherapy-related forms).
  • Atrial fibrillation and other arrhythmias

Other contributors include chronic kidney disease, sleep apnea, thyroid disorders, and heavy alcohol use. Because coronary artery disease is such a common cause, treating blocked arteries is often part of preventing or managing heart failure.

What are the symptoms of heart failure?

Common symptoms include shortness of breath (especially with activity or when lying flat), fatigue and weakness, swelling in the legs, ankles, or feet, a rapid or irregular heartbeat, persistent cough or wheezing, and sudden weight gain from fluid retention.

Doctors often grade how much symptoms limit daily life using the New York Heart Association (NYHA) classes: Class I means no limitation, Class II slight limitation with ordinary activity, Class III marked limitation with light activity, and Class IV symptoms even at rest. Tracking which class you’re in helps your care team measure whether treatment is working.

How is heart failure diagnosed?

Diagnosis combines your symptoms and exam with targeted testing. At MVM, advanced cardiovascular diagnostics such as echocardiography play a central role:

  • Echocardiogram – the key imaging test; it measures ejection fraction and reveals problems with the heart muscle, valves, and filling.
  • BNP or NT-proBNP blood tests – natriuretic peptides that rise when the heart is under strain; they help confirm heart failure and gauge its severity.
  • Electrocardiogram (ECG) – detects prior heart attack, ischemia, or rhythm problems.
  • Additional testing – chest X-ray, blood work, and sometimes cardiac MRI or catheterization to find the underlying cause.

How is heart failure treated?

Treatment has advanced dramatically. For heart failure with a reduced ejection fraction, national guidelines now recommend starting four foundational classes of medication – sometimes called the “four pillars” – and using them together rather than one at a time.

The four pillars of medical therapy

  • ARNI (or an ACE inhibitor / ARB) – relaxes blood vessels and eases the heart’s workload.
  • Beta-blockers – slow the heart and help it pump more efficiently.
  • Mineralocorticoid receptor antagonists (MRAs) – reduce fluid retention and protect the heart.
  • SGLT2 inhibitors – a newer class that lowers hospitalizations and deaths, used even in people without diabetes.

Diuretics (“water pills”) are added to relieve fluid buildup. For heart failure with preserved ejection fraction, SGLT2 inhibitors are now a cornerstone, and this is an actively evolving area of research.

Procedures, devices, and advanced options

  • Treating the underlying cause – for example, coronary or vascular revascularization to restore blood flow when blocked arteries are contributing.
  • Implantable devices – defibrillators (ICDs) to prevent sudden cardiac death and cardiac resynchronization therapy (CRT) to coordinate the heartbeat in selected patients.
  • Advanced therapies – for end-stage disease, mechanical pumps (LVADs) and heart transplantation.

Lifestyle and self-care

Daily weight monitoring, limiting sodium (and sometimes fluids), staying as active as your team advises, taking medications consistently, and controlling blood pressure and diabetes all make a measurable difference in how you feel and how often you need the hospital.

Talk to a heart & vascular specialist At MVM Heart, Vein, & Vascular Centers, our team pairs advanced diagnostics with compassionate, personalized care, with offices in Kendall, Homestead, and Boynton Beach, Florida. Schedule a consultation or call 305-279-2621 to get answers tailored to you.

Frequently asked questions about heart failure

Is heart failure the same as a heart attack?

No. A heart attack is a sudden event in which blood flow to part of the heart is blocked. Heart failure is an ongoing condition in which the heart doesn’t pump well enough over time. A heart attack can, however, lead to heart failure by damaging the heart muscle.

Can you live a long life with heart failure?

Many people do. With early diagnosis, modern guideline-based medications, and healthy lifestyle changes, many patients control symptoms, avoid hospitalizations, and stay active for years. Outcomes are best when treatment starts early and is taken consistently.

What’s the most important thing I can do at home?

Weigh yourself daily and call your care team if you gain several pounds in a few days, your swelling worsens, or you become more breathless – these can be early signs of fluid buildup that are much easier to treat when caught early.

This article is for general educational purposes and is not a substitute for personalized medical advice. Always consult a qualified healthcare provider about your specific condition.

References

  1. Heidenreich PA, et al. 2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure. Circulation. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001063
  2. Heart Failure Society of America. HF Stats 2025: Heart Failure Epidemiology and Outcomes Statistics. https://hfsa.org/hf-stats-2025-heart-failure-epidemiology-and-outcomes-statistics
  3. National Heart, Lung, and Blood Institute. Heart Failure. https://www.nhlbi.nih.gov/health/heart-failure
  4. American Heart Association. Devices and Surgical Procedures to Treat Heart Failure. https://www.heart.org/en/health-topics/heart-failure/treatment-options-for-heart-failure/devices-and-surgical-procedures-to-treat-heart-failure

Disclaimer: This article is general educational information, not medical advice for any specific person. For personalized guidance, please schedule a consultation or talk to your physician.