Heart Murmur: Causes, Symptoms, and Evaluation

A heart murmur is an extra sound heard during a heartbeat, usually caused by blood moving through the heart in a way that creates vibration. Many murmurs are harmless, but some may point to a heart condition that deserves further evaluation.

Overview

A heart murmur is an extra sound a clinician hears when listening to the heart with a stethoscope. It often sounds like a whooshing, swishing, or humming noise and usually appears because blood is moving through the heart or nearby vessels in a way that creates turbulence.

The important point is that a murmur is not a disease on its own. It is a clue that may be completely harmless, especially in children, pregnant people, or during times when the heart is working harder. In other situations, it can be a sign of a valve problem, a structural heart issue, or another condition that needs a closer look.

For patients deciding whether to seek care, the question is usually not “Is there a murmur?” but “Why is it there, and does it matter?” That distinction guides whether simple reassurance is enough or whether further testing is worthwhile.

Symptoms

Many people with a heart murmur feel entirely well and never notice anything unusual. In those cases, the murmur is found during a routine checkup, a sports physical, or an exam for another concern.

When a murmur is related to a heart condition, symptoms may reflect how well the heart is pumping blood. These can include shortness of breath, chest discomfort, unusual tiredness, palpitations, dizziness, swelling in the legs or abdomen, or reduced ability to exercise. In children, feeding difficulty, poor weight gain, or getting tired quickly may be clues.

Some murmurs change with body position, fever, dehydration, stress, pregnancy, or exercise. A change in sound does not automatically mean danger, but it can help clinicians decide whether the murmur is likely innocent or needs further evaluation.

Causes & Risk Factors

Heart murmurs arise when blood flow becomes more turbulent than usual. This can happen for harmless reasons, such as a naturally high-flow state, or because of a medical issue that changes the heart’s structure or function.

Common innocent causes include fever, anemia, pregnancy, rapid growth in children, and temporary changes in circulation. These murmurs are usually not associated with heart damage and may disappear once the underlying trigger settles.

Pathologic murmurs can be linked to valve narrowing or leakage, congenital heart differences present from birth, infection of the heart valves, cardiomyopathy, or other conditions that alter blood flow. Risk is higher in people with a personal or family history of heart disease, rheumatic fever, valve disease, certain genetic conditions, or prior heart infection.

• Innocent flow murmur
• Valve stenosis or regurgitation
• Congenital heart defect
• Infection affecting the heart valves
• Conditions that increase blood flow, such as anemia or pregnancy

Diagnosis

Diagnosis starts with a careful conversation and physical exam. A doctor will ask when the murmur was first noticed, whether symptoms are present, and whether there is a family history of heart disease or sudden cardiac problems. The timing, pitch, and location of the murmur often give early clues.

If the murmur seems innocent, a clinician may simply recommend observation. If the sound suggests a possible structural issue, an echocardiogram is usually the most helpful next test because it shows the heart’s chambers, valves, and blood flow in real time. Depending on the situation, an electrocardiogram, chest X-ray, blood tests, or additional imaging may also be used.

For international patients, this step is often where expert coordination matters. Records from home, prior scans, and a clear symptom timeline can help the cardiology team decide which tests are truly needed and avoid unnecessary repetition.

Treatment Options

Treatment depends entirely on the cause. An innocent murmur does not need specific therapy, though the underlying trigger—such as fever or anemia—may be treated if present. In these cases, the murmur may fade as the body returns to baseline.

If the murmur is caused by a valve problem or another structural condition, treatment may range from monitoring to medication or a procedure. Doctors may recommend medicines that reduce symptoms or protect heart function, and in some cases valve repair or valve replacement may be considered. The plan is individualized based on symptoms, test results, and how the condition affects daily life.

In children with congenital heart disease, treatment may involve pediatric cardiology and sometimes cardiac surgery or catheter-based repair. The aim is not to treat the sound itself, but to address the underlying reason for the sound in the safest way possible.

Prevention & Self-care

Not every murmur can be prevented, especially those related to congenital heart differences. Still, general heart-health habits can support overall cardiovascular well-being and reduce strain on the heart.

Self-care starts with following up as advised, keeping test results and medication lists organized, and reporting new symptoms rather than waiting for the next routine visit. People who travel for care may find it helpful to keep copies of echo reports, discharge notes, and a simple symptom diary, especially if they plan follow-up back home.

Healthy routines can also help: staying active within medical advice, maintaining a balanced diet, avoiding tobacco, managing blood pressure and anemia when present, and seeking treatment for infections promptly. For those with a known valve condition, dental and infection-prevention guidance from a doctor may be important.

When to See a Doctor

A murmur found during a checkup should be discussed with a doctor, even if there are no symptoms. Many murmurs are benign, but only an appropriate evaluation can tell whether monitoring is enough or whether further testing is needed.

Prompt medical review is especially important if the murmur is accompanied by chest pain, fainting, shortness of breath, bluish lips, new swelling, fever, or a noticeable drop in exercise tolerance. In infants and children, poor feeding, poor growth, sweating with feeds, or unusual fatigue should also be assessed.

People planning care across borders may want a cardiology team that can interpret prior imaging, explain the findings clearly, and coordinate follow-up after travel. Acibadem Health Point’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat heart murmurs and related conditions for international patients.

Living With a Heart Murmur

For many people, learning that they have a murmur is more unsettling than the murmur itself. Once the cause is understood, the path forward is often straightforward: reassurance, periodic monitoring, or treatment of an underlying heart condition.

It can help to ask practical questions during the visit: Is the murmur innocent or abnormal? Does it require an echocardiogram? Are there activity restrictions? What symptoms should prompt urgent care? Clear answers make it easier to plan daily life, work, travel, and follow-up.

When care is being arranged from another country, a well-documented evaluation makes continuation smoother. Shared records, a plain-language summary, and a follow-up plan reduce uncertainty and help the next clinician pick up care without delay.

Frequently asked questions

Is a heart murmur always a sign of heart disease?

No. Many heart murmurs are innocent and occur in otherwise healthy people. A doctor considers the murmur’s features, symptoms, and test results before deciding whether it reflects a heart problem.

Can adults develop a heart murmur later in life?

Yes. A murmur can appear later if a valve changes with age, if anemia develops, or if another condition affects blood flow. New murmurs in adults are usually worth evaluating.

What test is most commonly used to check a murmur?

An echocardiogram is often the key test because it shows the heart’s valves and pumping function. The doctor may also use an electrocardiogram or other tests depending on the situation.

Does a heart murmur mean sports or exercise must stop?

Not always. Many people with innocent murmurs can remain active, but anyone with symptoms or an abnormal evaluation should ask a doctor about safe activity levels before continuing strenuous exercise.

Can a child outgrow a heart murmur?

Yes, many childhood murmurs are innocent and become less noticeable as the child grows. If a murmur is linked to a structural heart issue, the long-term plan will depend on the specific diagnosis.

When should someone seek urgent care for a murmur?

Urgent care is appropriate if the murmur comes with chest pain, fainting, breathing difficulty, blue discoloration, a high fever, or sudden swelling. These symptoms may indicate a condition that needs prompt assessment.

References

• American Heart Association
• Mayo Clinic
• National Heart, Lung, and Blood Institute
• MedlinePlus

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.