# Can Cats Have Heart Problems or Heart Failure?

Yes, cats can have heart problems, and those problems can progress to heart failure. Heart disease is common in cats, especially as they get older, and it often goes unnoticed until the heart can no longer keep blood moving normally through the body [1]. The good news is that early detection and good management can give many cats months to years of comfortable life.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

## Quick Answer

- Heart disease means any abnormality of the heart, including problems with structure, function, or electrical activity [1].
- Heart failure is not a separate disease. It is a syndrome that develops when severe heart disease prevents the cardiovascular system from maintaining normal blood circulation [2].
- Slightly more than 10% of animals examined by a veterinarian have some form of cardiovascular disease [1].
- Hypertrophic cardiomyopathy (HCM) is the most common inherited cardiac disease in cats and a leading cause of congestive heart failure [3].
- Cats often hide heart disease well, so a heart murmur, a fast breathing rate at rest, or sudden trouble breathing are all reasons to call your veterinarian.

## What Heart Problems and Heart Failure Mean in Cats

Heart disease is any abnormality of the heart. It covers a wide range of conditions, including congenital defects present at birth, disorders of physical structure, problems with how the heart functions, and electrical disturbances such as an abnormal rhythm [1].

Heart failure is different. It is a syndrome, not a specific disease or diagnosis. It happens when severe heart dysfunction causes the cardiovascular system to fail at maintaining adequate blood circulation [2]. The cardiovascular system has three main jobs: keep blood pressure normal, keep cardiac output (the amount of blood the heart pumps) normal, and keep venous and capillary pressures normal [4]. When the heart can no longer do all three, fluid backs up into the lungs or chest, or the body does not get enough blood flow.

Veterinarians often describe heart failure as left-sided, right-sided, or biventricular (both sides). Left-sided failure tends to cause fluid in the lungs. Right-sided failure tends to cause fluid in the chest or abdomen. Many cats have a mix.

## Signs Owners Notice

Cats are masters at hiding illness. A cat with mild heart disease may look completely normal. Signs usually appear when the disease becomes severe or when heart failure develops.

### Early or subtle signs

- A heart murmur heard by your veterinarian
- A gallop rhythm or abnormal heart sound
- Sleeping more or tiring faster than usual
- Hiding more often
- Slightly reduced appetite

### Signs of heart failure

The most common signs of heart failure come from edema and effusion, which means fluid buildup (congestive or backward heart failure) [4]. In cats, this often shows up as:

- Fast or labored breathing at rest
- Open-mouth breathing or panting
- Coughing (less common in cats than in dogs)
- Weakness or collapse
- Cool paws or pale gums
- Sudden hind leg paralysis or severe pain, which can happen when a blood clot blocks blood flow to the legs

Less commonly, signs come from a drop in cardiac output (forward heart failure), such as weakness and lethargy [4]. In rare cases, a cat can present with cardiogenic shock, which is low blood pressure caused by a severe drop in cardiac output [4].

One practical tool: count your cat's breaths while it sleeps. A normal resting breathing rate is usually under 30 breaths per minute. If you consistently count more than that, call your veterinarian.

## Causes and Risk Factors

### Hypertrophic cardiomyopathy (HCM)

HCM is the most common inherited cardiac disease in cats, and it often leads to congestive heart failure, arterial thromboembolism (blood clots), and sudden cardiac death [3]. In HCM, the heart muscle thickens, which makes the ventricle stiff and reduces its ability to fill with blood [2]. HCM affects about 14.7% of domestic cats, compared with 0.2% of humans [5]. Some breeds have a higher risk, including the Siberian, Chartreux, Somali, and Norwegian Forest Cat. If you own one of these breeds, talk with your veterinarian about screening. You can read more about breed-specific risks in our articles on [Siberian Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/siberian-cat-health-problems-inherited-conditions-and-cardiac-screenings) and [Norwegian Forest Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/norwegian-forest-cat-health-problems-inherited-conditions-and-cardiac-screenings).

### Other causes

- **Congenital heart defects.** Some cats are born with abnormal heart structures, such as a hole between the chambers or malformed valves [1].
- **Valve disease.** Valves can thicken, leak, or rupture. Acute chordal rupture (a torn valve support structure) is the most common cause of acute heart failure in animals and leads to increased left atrial pressure and pulmonary edema [4].
- **Electrical disturbances.** Abnormal rhythms such as atrial fibrillation can reduce the heart's pumping efficiency [1].
- **Pericardial disease.** Fluid in the sac around the heart can compress it and block blood flow into the heart [2].
- **Rare systemic diseases.** Hypereosinophilic syndrome, a rare disorder with sustained high eosinophil counts, can damage the heart and cause congestive heart failure. One report described a three-year-old cat with this condition who developed left-sided congestive heart failure [6].
- **Age.** Heart disease becomes more common as cats get older, and it frequently coexists with kidney disease in senior cats [7].

### Risk factors

- Age (older cats are at higher risk)
- Breed (certain breeds have higher rates of HCM)
- Being male (some heart conditions are more common in male cats)
- High blood pressure or kidney disease
- Obesity and dental disease may add stress to the heart, though the exact links are not fully established

## How Veterinarians Diagnose Heart Problems in Cats

Diagnosis starts with a physical exam. Your veterinarian will listen to the heart and lungs, check the gums and pulses, and feel the thyroid gland. A heart murmur or an abnormal rhythm is often the first clue.

Common tests include:

- **Chest X-rays.** These show the size and shape of the heart and whether fluid is in the lungs or chest.
- **Echocardiography (ultrasound of the heart).** This is the most important test. It shows the thickness of the heart walls, the size of the chambers, how well the valves work, and how well the heart muscle contracts. Newer techniques such as strain echocardiography can detect subtle myocardial dysfunction that conventional echocardiography may miss [8].
- **Blood tests.** These check kidney values, thyroid hormone, electrolytes, and other organ function. They also help rule out other causes of the signs.
- **Blood pressure measurement.** High blood pressure can damage the heart and other organs.
- **Electrocardiogram (ECG).** This records the heart's electrical activity and helps identify arrhythmias.
- **NT-proBNP blood test.** This measures a hormone released by stretched heart muscle. It can support a diagnosis of heart failure, though it is not perfect.

Your veterinarian may refer you to a veterinary cardiologist for an echocardiogram and long-term management.

| Test | What it shows | Why it matters |
|---|---|---|
| Physical exam | Murmurs, rhythm, pulses, breathing rate | First clue to heart disease |
| Chest X-rays | Heart size, lung fluid, chest fluid | Confirms congestive heart failure |
| Echocardiogram | Wall thickness, chamber size, valve function, contractility | Identifies the specific type of heart disease |
| Blood tests | Kidney values, thyroid, electrolytes, NT-proBNP | Rules out other causes and guides treatment |
| Blood pressure | Hypertension | High blood pressure can worsen heart disease |
| ECG | Electrical rhythm | Detects arrhythmias |

## Treatment Options

Treatment depends on the type of heart disease and whether heart failure is present. There is no single cure for most forms of feline heart disease, but many cats live comfortably for a long time with the right plan.

### Medications

Veterinarians commonly use:

- **Diuretics** to remove excess fluid from the lungs or chest. These are the mainstay of congestive heart failure treatment.
- **ACE inhibitors** to lower blood pressure and reduce the heart's workload.
- **Beta-blockers** to slow the heart rate and reduce oxygen demand, especially in HCM.
- **Calcium channel blockers** to help the heart relax in some cases of HCM.
- **Anticoagulants** to reduce the risk of blood clots in cats with severe heart disease.
- **Pimobendan** to improve heart muscle contraction in some cats with dilated cardiomyopathy or other conditions.

Your veterinarian calculates every dose from your cat's weight, kidney function, and other health factors. Never give human heart medication to a cat. Some common human drugs, including paracetamol (acetaminophen), are highly toxic to cats. One report described a cat with pre-existing HCM who developed congestive heart failure after ingesting paracetamol [9].

### Other treatments

- **Oxygen therapy** for cats in respiratory distress.
- **Thoracocentesis** to drain fluid from the chest.
- **Pericardiocentesis** to drain fluid from the sac around the heart.
- **Diet changes.** Moderately restricted sodium may help, but your veterinarian will set the target.
- **Treating underlying conditions** such as hyperthyroidism or high blood pressure.

### Monitoring at home

Your veterinarian will likely ask you to:

- Count your cat's resting breathing rate daily
- Watch for changes in appetite, energy, and hiding behavior
- Keep a log of any coughing, labored breathing, or weakness
- Bring your cat in for regular rechecks, often every 3 to 6 months

## Recovery, Outlook, and Long-Term Management

The outlook for a cat with heart disease varies widely. Some cats with mild HCM live normal lives for years. Others develop heart failure and need lifelong medication.

Once congestive heart failure develops, it is usually managed, not cured. Many cats do well for months to years with good care. The median survival time after a first episode of congestive heart failure is often measured in months, but some cats live much longer. Your veterinarian can give you a more specific estimate based on your cat's heart condition, kidney function, and response to treatment.

Heart disease and kidney disease often occur together in older cats, and treating one can affect the other. For example, diuretics help the heart by removing fluid, but they can reduce blood flow to the kidneys and worsen kidney values [7]. This balancing act is one reason regular blood work and checkups matter so much.

Cats with severe heart disease are also at risk for arterial thromboembolism, a blood clot that blocks blood flow to the hind legs. This is a painful, life-threatening emergency. If your cat suddenly cannot use its back legs, cannot bear weight, or cries out in pain, seek emergency care immediately.

## Prevention

You cannot prevent every heart problem, but you can lower the odds and catch problems earlier.

- **Regular veterinary checkups.** Slightly more than 10% of animals examined by a veterinarian have some form of cardiovascular disease, so routine exams are your best screening tool [1].
- **Breed screening.** If you have a Siberian, Chartreux, Somali, or Norwegian Forest Cat, ask your veterinarian about cardiac screening. You can learn more in our article on [Chartreux Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/chartreux-cat-health-problems-inherited-conditions-and-cardiac-screenings).
- **Keep your cat at a healthy weight.** Obesity puts extra demand on the heart.
- **Treat high blood pressure and hyperthyroidism early.** Both can damage the heart over time.
- **Dental care.** Chronic dental disease can contribute to systemic inflammation, though the direct link to heart disease in cats is not fully established.
- **Know your cat's normal breathing rate.** This simple habit helps you spot trouble early.
- **Avoid human medications.** Never give your cat any human drug without veterinary guidance.

## Limitations and When to Contact a Veterinarian

This article gives general information. Every cat is different, and your veterinarian needs to examine your cat to make a diagnosis and set a treatment plan.

**Call your veterinarian the same day if you notice:**

- A resting breathing rate consistently above 30 breaths per minute
- New coughing or increased breathing effort
- Reduced appetite or increased hiding
- Weakness or reluctance to move

**Go to an emergency clinic immediately if you notice:**

- Open-mouth breathing or gasping
- Blue or pale gums
- Sudden hind leg paralysis or severe pain
- Collapse or unresponsiveness
- Known or suspected ingestion of a toxic substance, such as paracetamol

**Schedule a routine visit if:**

- Your cat has a new heart murmur
- Your cat is due for a senior wellness exam
- You have a breed with a known risk of HCM
- You want to learn how to monitor breathing rate at home

## Frequently Asked Questions

### Can cats have heart failure?

Yes. Heart failure in cats is a syndrome that develops when severe heart disease prevents the cardiovascular system from maintaining normal blood circulation [2]. It is most often caused by conditions such as hypertrophic cardiomyopathy, valve disease, or congenital defects.

### What are the first signs of heart problems in cats?

The earliest sign is often a heart murmur heard by your veterinarian. At home, you may notice your cat sleeping more, hiding, or breathing faster than usual. Some cats show no signs at all until heart failure develops.

### How long can a cat live with heart disease?

It depends on the type and severity. Cats with mild HCM may live normal lives for years. Cats with congestive heart failure often survive months to a few years with treatment. Your veterinarian can give you a better estimate after examining your cat.

### Is heart disease in cats painful?

Heart disease itself is usually not painful. However, a blood clot that blocks blood flow to the legs causes severe pain and is an emergency. If your cat suddenly cries out or cannot use its back legs, seek emergency care right away.

### Can heart disease in cats be cured?

Most forms of heart disease in cats cannot be cured, but they can be managed. Treatment focuses on controlling symptoms, slowing progression, and preventing complications such as blood clots and fluid buildup. Some congenital defects can be repaired with surgery, but this is uncommon in cats.

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## Related Articles

- [Hypertrophic Cardiomyopathy in Cats](/knowledge/veterinary-medicine/clinical-methods/hypertrophic-cardiomyopathy-in-cats)
- [Siberian Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/siberian-cat-health-problems-inherited-conditions-and-cardiac-screenings)
- [Chartreux Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/chartreux-cat-health-problems-inherited-conditions-and-cardiac-screenings)
- [Somali Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/somali-cat-health-problems-inherited-conditions-and-cardiac-screenings)
- [Norwegian Forest Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/norwegian-forest-cat-health-problems-inherited-conditions-and-cardiac-screenings)
- [Bombay Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/bombay-cat-health-problems-inherited-conditions-and-cardiac-screenings)
- [Heart Failure in Cats: Symptoms, Stages, and Care](/knowledge/veterinary-medicine/senior-and-chronic-care/heart-failure-in-cats-symptoms)
- [Heart Failure in Cats: Medications and Home Care](/knowledge/veterinary-medicine/senior-and-chronic-care/heart-failure-cats-medication)
- [Enlarged Heart in Cats: Causes, Stages, and Life Expectancy](/knowledge/veterinary-medicine/senior-and-chronic-care/enlarged-heart-cats-prognosis)
- [Heartworm Disease in Cats: Diagnostic Challenges and Treatment Options](/knowledge/parasites/pet-parasites/heartworm-disease-cats-diagnostic-challenges-treatment-options)

## References

1. [Heart Disease and Heart Failure in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/heart-and-blood-vessel-disorders-of-cats/heart-disease-and-heart-failure-in-cats). Merck Veterinary Manual.
2. [Heart Failure in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/heart-and-blood-vessel-disorders-of-cats/heart-failure-in-cats). Merck Veterinary Manual.
3. [Unraveling the genetics of feline hypertrophic cardiomyopathy: a multiomics study of 138 cats](https://pubmed.ncbi.nlm.nih.gov/40609041/). G3 (Bethesda, Md.), 2025.
4. [Heart Failure in Dogs and Cats - Circulatory System](https://www.merckvetmanual.com/circulatory-system/heart-failure-in-dogs-and-cats/heart-failure-in-dogs-and-cats). Merck Veterinary Manual.
5. [Phenotypic patterns in feline heart failure: A natural model for understanding variable disease severity in humans](https://pubmed.ncbi.nlm.nih.gov/42473663/). iScience, 2026.
6. [Congestive heart failure secondary to hypereosinophilic syndrome with cardiac involvement in a cat](https://pubmed.ncbi.nlm.nih.gov/42263443/). Journal of veterinary cardiology : the official journal of the European Society of Veterinary Cardiology, 2026.
7. [Feline comorbidities: cardiovascular and kidney diseases](https://pubmed.ncbi.nlm.nih.gov/41863293/). Journal of feline medicine and surgery, 2026.
8. [Evaluation of myocardial function by strain echocardiography in cats with hypertrophic cardiomyopathy phenotypes](https://pubmed.ncbi.nlm.nih.gov/42634778/). Veterinary world, 2026.
9. [Presumed acute myocardial damage in a British Shorthair cat with previously diagnosed hypertrophic cardiomyopathy](https://pubmed.ncbi.nlm.nih.gov/42174688/). Irish veterinary journal, 2026.

## Further Reading

- [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners)
- [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information)
- [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)