Understanding the Four Stages of Heart Failure

Contrary to how the term “heart failure” sounds, it doesn’t mean your heart has stopped working. Really, it simply means your heart isn’t pumping blood as well as it should, which can affect how your body gets the oxygen and nutrients it needs.

Heart failure typically develops over time, and doctors use clear stages to describe how advanced it is. Knowing the four stages of heart failure can help you recognize changes in your heart, understand what your care team is looking for and take steps to protect your heart at every phase.

Defining Heart Failure

Heart failure happens when the heart muscle becomes too weak or stiff to pump blood effectively. This can happen for many reasons, including damage from a heart attack, long-standing high blood pressure (hypertension) or conditions that affect the heart muscle itself.

People experience heart failure differently. Some notice symptoms early, while others may not see any problems at all until the condition has gotten worse. That’s why doctors rely on staging systems to guide treatment and support.

Why Heart Failure Is Divided into Stages

Heart failure is not a one-size-fits-all condition. The four stages help health care providers understand:

• How much the heart has been affected
• What treatments may help keep it from getting worse
• Whether symptoms are present

A commonly used staging system is one developed by the American College of Cardiology and the American Heart Association. The stages of this classification system progress in one direction, meaning once you advance to a later stage, you can either stay there or move forward. Although you can’t go backward, your symptoms and quality of life can still improve with proper care.

Stage A: At Risk for Heart Failure

At this stage, your heart is still functioning normally, and there are no symptoms of heart failure. However, certain conditions can increase the risk of developing it later.

Common risk factors for congestive heart failure include:

• A family history of heart disease
• Coronary artery disease
• Diabetes
• Exposure to medicines that affect the heart
• High blood pressure
• Obesity

If you or a loved one has stage A heart failure, it’s important to know this is a critical time for prevention. Managing your blood pressure, staying physically active, eating a heart-healthy diet and keeping up with regular check-ups can help prevent progression.

Stage B: Structural Heart Changes Without Symptoms

Stage B is sometimes called pre-heart failure. At this stage, the heart’s structure or function has changed, but symptoms have not yet developed. For example, you may experience damage to the heart muscle after having a heart attack.

Even if you don’t have noticeable symptoms, you need medical attention at this stage. Treatment often focuses on:

• Managing underlying conditions
• Medications to protect heart function
• Monitoring heart health over time

Addressing heart changes early may help delay or keep symptoms from appearing later.

Stage C: Symptomatic Heart Failure

Stage C is when heart failure symptoms are present or have been present in the past. Common symptoms include:

• Fatigue or low energy
• Rapid or irregular heartbeat
• Shortness of breath, especially with activity
• Swelling in the legs, ankles or feet
• Trouble lying flat due to breathing discomfort

At this stage, your doctor may also use the New York Heart Association (NYHA) Functional Classification system to describe how your symptoms are affecting your daily activities. This system helps tailor treatment and track the effectiveness of any therapies you’ve received.

Treatment at this stage typically includes medication, lifestyle modifications, and ongoing monitoring.

Stage D: Advanced Heart Failure

Stage D is advanced heart failure that isn’t responding to standard treatments. Symptoms are more severe and may interfere with your daily life, even when you’re resting. At this stage, you may experience ongoing discomfort and require frequent hospital visits.

Care typically focuses on managing severe symptoms, improving quality of life and exploring advanced treatments. Some of your options may include a heart transplant or surgery to implant a medical device to help the heart work better. Your doctor may also recommend medications, such as inhibitors, to reduce excess fluid in the body and relax blood vessels.

How Heart Failure Is Classified Beyond Stages

In addition to stages, your doctor may describe your condition by where it occurs in the heart, such as:

• Biventricular heart failure
• Left-sided heart failure
• Right-sided heart failure

They may also describe your condition as either acute heart failure or chronic heart failure, depending on whether you have a sudden onset or rapid worsening of symptoms. These further classifications can help guide your treatments and monitoring.

Living Well at Any Stage of Heart Failure

Although heart failure is a serious condition, many people can continue to live active and fulfilling lives.

Still, if you notice new or worsening symptoms — such as increased shortness of breath, swelling or sudden weight gain — it’s important to reach out to your doctor right away. Early attention can help prevent complications and support better outcomes.

At AdventHealth, our team focuses on treating the whole person — body, mind and spirit — with compassionate, coordinated care at every stage of heart failure. Our goal is to provide you with the level of care you need to live your best possible life. Learn more about treatment and heart failure prevention at AdventHealth.