Heart Failure Isn’t a Heart Attack: Know the Difference

What Is a Heart Attack?

A heart attack, known as a myocardial infarction in medical terms, happens when a blood vessel in the heart gets blocked [1]. Think of it as a plumbing crisis: the pipes supplying the heart get cut off.

In most cases, a heart attack is caused by fatty deposits that slowly build up inside the arteries supplying the heart. When a plaque ruptures, it triggers a blood clot that blocks the artery. Less commonly, a sudden tightening of the artery wall, a coronary spasm, or a tear inside the artery (spontaneous coronary artery dissection) can also cause a heart attack [1].

The critical point: the heart is still beating. The heart needs a proper flow of blood to keep working. If the blockage is not cleared quickly, the heart can be damaged.

What Is Heart Failure?

Heart failure does not mean the heart has stopped. It means the heart muscle has become too weak or too stiff to pump enough blood to meet the body’s needs [2].

Think of it as a mechanical problem: the pump itself is failing, not the pipes. Unlike a heart attack, heart failure develops gradually, over months or years [3].

There are two main types:

• Systolic heart failure (HFrEF): The heart muscle is too weak to squeeze properly and pump blood out.
• Diastolic heart failure (HFpEF): The heart is too stiff to fill properly before the next beat.

In the early stages, there may be no symptoms at all. When symptoms do appear, they worsen progressively as the heart grows weaker. With the right treatment, medications, lifestyle changes, and, in some cases, surgery, symptoms can improve significantly, and pumping function can be partially restored.

Also read: Heart Attack in Youth: Why Young Indians Are Getting It at 35

Heart Attack vs Heart Failure vs Cardiac Arrest

This three-way confusion is one of the biggest content gaps in public health education in India. Here is a clear comparison:

Cardiac arrest is a purely electrical problem; a disruption of the heart’s rhythm causes it to stop beating. A heart attack and cardiac arrest are not the same. Most heart attacks do not stop the heart, but some can.

Warning Signs of a Heart Attack

The signs of a heart attack vary from person to person. Common warning signs include:

• Chest pain or pressure, described as squeezing, tightness, or a heavy weight, is the most common sign of a heart attack
• Pain that spreads to the jaw, neck, arms, upper back, or stomach, often dismissed as muscle pain or acidity
• Sudden shortness of breath, even without physical exertion or any strenuous activity
• Cold sweats, nausea, or vomiting; these symptoms are especially common in women and in people with diabetes
• Lightheadedness or sudden loss of consciousness, a sign that the heart is no longer pumping adequately

One important note for Indian readers: people with diabetes are more likely to experience a silent heart attack, one with no chest pain at all. Unusual fatigue, mild indigestion, or brief neck discomfort may be the only warning. Do not dismiss these.

Warning Signs of Heart Failure

Heart failure symptoms tend to build slowly, which is exactly why they get ignored:

• Shortness of breath during routine activity, climbing stairs, walking short distances, or when lying flat at night
• Persistent swelling in the legs, ankles, and feet caused by fluid retention in the body
• Rapid, unexplained weight gain over just a few days as fluid accumulates in the body
• A persistent cough or wheeze, sometimes producing white or pink mucus, that does not go away
• Severe fatigue and difficulty concentrating; even mild tasks feel exhausting for the person

If you or a family member has been noticing ankle swelling or worsening breathlessness and attributing it to old age or weakness, please do not wait.

What Causes Each Condition?

Both conditions share the same root triggers, but the path from risk factor to diagnosis differs.

In a large multi-centre Indian registry of 997 premature coronary artery disease patients across 22 centres, the leading risk factors were hypertension (49%), diabetes (44%), tobacco use (39%), and obesity or overweight (56%) [4]. Nearly half also had a family history of premature heart disease. These are not abstract statistics; they reflect the real profile of cardiac patients walking into hospitals like Eskag Sanjeevani in Kolkata every week.

How to Avoid a Heart Attack and Reduce Heart Failure Risk

Prevention for both conditions overlaps almost entirely:

• Keep your blood pressure and blood sugar under control by getting them checked regularly.
• If you smoke or use tobacco, try to quit. It can slowly damage your heart and blood vessels.
• Follow a heart-healthy diet. Eat more fruits, vegetables, whole grains, and healthy fats. Cut down on salty, oily, and packaged foods.
• Stay active every day. Even a 30-minute walk can help keep your heart healthy.
• Ask if heart disease runs in your family. If it does, talk to your doctor about getting checked earlier.

The CADY registry also found that psychosocial stress was a significant factor in over half of premature CAD patients in India. Managing chronic stress is not optional; it is cardiac care.

When Should You See a Cardiologist?

Do not wait for a dramatic chest-clutching moment. See a cardiologist promptly if you notice any of the following:

• Chest discomfort or pressure that comes and goes, even if mild or brief, and has not been evaluated.
• Ankle or leg swelling that is new, worsening, or does not improve after a night’s rest.
• Breathlessness that has gradually worsened over weeks, especially at rest or when lying flat.
• Rapid or irregular heartbeat with accompanying dizziness, fatigue, or faintness
• Sudden weight gain of several kilograms within a few days with no clear dietary cause.

Recognising these warning signs early is important, but a timely consultation is only the first step. Your cardiologist may recommend a few tests to identify the underlying cause and decide on the most appropriate treatment.