Understanding murmurs, what they mean, and when to worry
Hearing that your cat has a heart murmur can feel scary — especially if you own a Bengal, a breed known for routine HCM (hypertrophic cardiomyopathy) screening. But the truth is this:
A heart murmur does NOT automatically mean your cat has HCM. In fact, many murmurs are harmless, temporary, or unrelated to heart disease at all.
This guide explains what murmurs are, why they happen, and how to understand your veterinarian’s recommendations with confidence.
❤️ What Exactly Is a Heart Murmur?
A heart murmur is simply an extra sound your veterinarian hears when listening to your cat’s heartbeat. Instead of the normal “lub‑dub,” a murmur adds a soft whooshing noise caused by turbulent blood flow.
A murmur is a symptom, not a diagnosis.
It can be caused by:
Normal variations in blood flow
Stress or excitement
Fever or dehydration
Anemia
Valve changes
Structural heart disease (including HCM)
This is why a murmur alone doesn’t tell the whole story.
🐾 Are Heart Murmurs Common in Kittens?
Yes — extremely.
Many kittens have what veterinarians call “innocent murmurs.” These are:
Soft
Temporary
Not associated with disease
Caused by a young, fast‑beating heart
Most innocent murmurs disappear by 4–6 months of age.
This is especially common in active, high‑energy breeds like Bengals and can be associated with stressful Vet visits.
🩺 Does a Murmur Mean My Cat Has HCM?
No — not by itself.
A murmur can be caused by HCM, but it can also be caused by dozens of other things, many of them harmless or temporary.
A murmur may be more concerning if:
It is loud (Grade 3 or higher)
It persists over multiple vet visits
Your cat is an adult
Your cat shows symptoms (rare)
Your vet hears abnormal rhythm or gallop sounds
But even then, only an echocardiogram can confirm or rule out HCM.
🧬 Why Bengals Are Screened for HCM
Bengals are one of the breeds where responsible breeders routinely screen breeding cats for HCM using a cardiac ultrasound performed by a board‑certified cardiologist.
This helps:
Reduce risk in kittens
Track heart health over time
Identify early changes
Support ethical breeding practices
If your breeder screens their cats regularly, your kitten already has a lower risk.
🔍 How Vets Evaluate a Heart Murmur
When your vet hears a murmur, they consider:
1. The Grade (1–6 scale)
Grade 1–2: soft, often innocent
Grade 3–4: moderate, may need follow‑up
Grade 5–6: loud, usually requires imaging
2. The Timing
Systolic murmurs are most common and often benign
Diastolic murmurs are more concerning
3. Your Cat’s Age
Kittens: often innocent
Adults: more likely to need evaluation
4. Symptoms
Most cats with murmurs show no symptoms at all.
🧪 When Should You Get an Echocardiogram?
Your vet may recommend an echo if:
The murmur is moderate to loud
It persists over multiple visits
Your cat is an adult
Your cat is a Bengal or another screened breed
There are other abnormal findings
An echocardiogram is the only way to diagnose or rule out HCM.
💛 If Your Cat Has a Murmur, Don’t Panic
Here’s what most owners don’t realize:
✔️ Many murmurs are harmless
✔️ Many kittens outgrow them
✔️ Many adult cats live long, healthy lives with murmurs
✔️ A murmur is not a diagnosis
✔️ HCM can only be confirmed by a cardiologist
A murmur is simply a signal to gather more information — not a reason to fear the worst.
🐆 What This Means for Bengal Owners
Because Bengals are routinely screened, a murmur in a Bengal kitten or adult cat is often:
Innocent
Stress‑related
Temporary
Not associated with HCM
If your breeder provides recent HCM screening results for your kitten’s parents, that’s a strong sign of responsible breeding and reduced risk.
🏡 What Should You Do Next?
If your kitten has a murmur:
Recheck at the next visit
Monitor growth and behavior
Follow your vet’s recommendations
Consider an echo if the murmur persists
If your adult cat has a murmur:
Schedule an echocardiogram
Keep regular vet checkups
Watch for subtle changes (rare)
Most cats with murmurs live completely normal lives.
💬 Final Thoughts
A heart murmur can sound alarming, but in reality, it’s often just a small variation in how your cat’s heart sounds — not a sign of disease. With proper screening, monitoring, and veterinary guidance, you can feel confident and informed about your Bengal’s heart health.
If you ever have questions about murmurs, HCM screening, or your kitten’s lineage, we’re always here to help.