What Are Cardiac Murmurs and When Do They Matter?

Cardiac murmurs are sounds made by blood moving through the heart or nearby blood vessels that can be heard with a stethoscope. Many are harmless, especially in children, but some may signal an underlying heart valve or structural condition that should be evaluated.

What are cardiac murmurs?

Cardiac murmurs, also called heart murmurs, are extra sounds heard between the normal heartbeats. They occur when blood flows through the heart or blood vessels in a way that creates audible turbulence. A clinician may describe the sound as whooshing, swishing, or blowing while listening to the chest with a stethoscope.

A murmur is a clinical finding rather than a disease in itself. It may be harmless, particularly in children, pregnant people, or adults with increased blood flow from fever or exercise. In other cases, it can be associated with a heart valve problem, a hole between heart chambers, or another condition affecting blood flow.

Doctors assess murmurs by their timing, location, loudness, pitch, and how the sound changes with body position or breathing. These details help indicate whether further testing is needed, but an echocardiogram is often the most useful test for examining the heart’s structure and blood flow.

Why does a heart murmur happen?

Blood normally travels smoothly through the heart’s chambers and valves. A murmur can develop when flow becomes faster or less smooth. For example, increased blood flow during childhood growth, pregnancy, fever, anemia, or an overactive thyroid may produce a temporary murmur even when the heart is structurally normal.

Some murmurs arise when a heart valve does not open fully, known as stenosis, or does not close tightly, known as regurgitation. These changes can be present from birth or develop later in life due to aging, calcium buildup, infection, rheumatic disease, or other heart conditions.

Congenital heart conditions can also cause murmurs. These include openings in the wall between heart chambers or changes in the way blood vessels and valves formed before birth. The meaning of a murmur depends on the person’s age, medical history, examination findings, and any symptoms.

• Innocent or functional murmur: caused by normal blood flow and not by heart disease.
• Congenital murmur: related to a structural heart difference present from birth.
• Acquired murmur: develops later, often because of valve disease or another medical condition.

What symptoms can occur with a heart murmur?

Innocent murmurs do not cause symptoms. They are often found incidentally during a routine health examination, sports physical, pregnancy visit, or childhood checkup. The person may feel completely well and may need no restrictions or treatment.

When a murmur is related to a significant heart condition, symptoms can reflect reduced blood flow, fluid buildup, or strain on the heart. Possible symptoms include shortness of breath during activity or at rest, unusual tiredness, reduced exercise tolerance, chest discomfort, palpitations, dizziness, or fainting.

In babies and young children, signs that deserve medical attention can include poor feeding, sweating during feeds, slow weight gain, fast breathing, or a bluish color around the lips or skin. These symptoms do not always mean that a murmur is serious, but they should be assessed promptly by a qualified clinician.

Should you worry if you have a heart murmur?

A heart murmur is not automatically a reason for concern. Many murmurs are innocent and have no effect on health, daily activities, or life expectancy. This is especially common in children, although innocent murmurs may also be heard in adults during pregnancy, fever, anemia, or other states that increase blood flow.

It is important not to assume that every murmur is harmless, particularly if it is newly identified in adulthood, becomes louder, or occurs with symptoms. A clinician may recommend an electrocardiogram, chest imaging, blood tests, or an echocardiogram to clarify whether the valves and heart chambers are working normally.

People with a known valve condition may need ongoing monitoring even when they feel well. Conditions such as heart valve disease can progress gradually, and regular follow-up allows changes in heart function or symptoms to be recognized early.

How are cardiac murmurs diagnosed?

Diagnosis begins with a medical history and physical examination. The clinician will ask about symptoms, family history of heart disease, past infections, pregnancy, medications, and medical conditions such as anemia or thyroid disease. During the examination, the clinician listens to the murmur and checks for signs of fluid retention, abnormal pulses, or changes in blood pressure.

An echocardiogram uses ultrasound to create moving images of the heart. It can show how well the heart pumps, whether the valves open and close properly, and how blood flows through the chambers. Doppler imaging, included with many echocardiograms, measures the direction and speed of blood flow.

Additional tests depend on the clinical situation. An electrocardiogram may identify rhythm changes or signs of heart strain, while blood tests can look for anemia, infection, or thyroid disease. Some people need follow-up echocardiograms over time rather than immediate treatment.

What is the best treatment for a heart murmur?

The best treatment for a heart murmur depends entirely on its cause. Innocent murmurs do not need medication, procedures, activity limits, or special diets. Treating the murmur itself is not necessary because it reflects normal blood flow rather than heart damage.

If an underlying condition is found, care focuses on that condition. For example, correcting anemia or managing thyroid disease may reduce a flow-related murmur. Valve conditions may be monitored with regular examinations and echocardiograms, while medicines may be used to manage symptoms, blood pressure, heart rhythm problems, or fluid retention when appropriate.

Some people with severe valve narrowing or leakage require a catheter-based procedure or surgery to repair or replace a valve. Decisions are based on symptoms, valve function, heart size and strength, overall health, and individual preferences. In selected cases, heart valve replacement surgery may be considered after a specialist assessment.

Acıbadem Health Point’s multidisciplinary specialists and JCI-accredited hospitals assess cardiac conditions and discuss appropriate diagnostic and treatment options for international patients.

What should you avoid if you have a heart murmur?

Most people with an innocent murmur do not need to avoid normal exercise, work, travel, or everyday activities. However, a person should not begin an intense new training program or competitive sport without medical advice if the murmur has not been evaluated, especially if there is chest pain, fainting, breathlessness, or a family history of sudden cardiac death.

People with a diagnosed heart condition should follow their clinician’s individualized advice about activity, salt intake, alcohol, smoking, and prescribed medicines. They should not stop cardiac medicines, use stimulant-containing supplements, or take unregulated remedies without discussing them with a healthcare professional, as these may affect heart rhythm or blood pressure.

Good dental hygiene is important for everyone. A small group of people with specific high-risk heart conditions may need preventive antibiotics before certain dental procedures, but this is not recommended for most people with murmurs. A dentist and cardiology clinician can advise when this precaution is appropriate.

Can you live a long life with a heart murmur?

Yes. Many people live a full, long life with a heart murmur, particularly when it is innocent or when the underlying cause is mild and appropriately monitored. A murmur alone does not predict a person’s outlook; the key question is whether it reflects a heart condition and, if so, how that condition affects heart function.

Modern monitoring and treatment have improved outcomes for many valve and congenital heart conditions. Keeping scheduled follow-up appointments, reporting new symptoms, managing blood pressure and cholesterol when relevant, avoiding tobacco, and maintaining regular physical activity within medical guidance can all support heart health.

For people with a confirmed structural heart condition, the care team may recommend periodic imaging and lifestyle guidance tailored to the individual. It is useful to keep a record of the diagnosis, test results, medicines, and any advice about exercise or procedures, especially when traveling or changing healthcare providers.

When to seek medical care

A newly detected murmur should be discussed with a doctor, particularly in adults or in anyone with a history of heart disease. Medical review is also appropriate if a previously known murmur changes or if there are new limitations in exercise tolerance, swelling in the legs or abdomen, persistent palpitations, or unusual fatigue.

Urgent medical care is needed for chest pain, severe or sudden shortness of breath, fainting, blue or gray lips or skin, or symptoms of stroke such as facial drooping, arm weakness, or speech difficulty. In infants, prompt assessment is important for trouble feeding, poor growth, rapid breathing, or blue coloring.

Most murmurs can be assessed in a calm, stepwise way. Timely evaluation helps distinguish harmless sounds from conditions that benefit from monitoring or treatment and can provide reassurance when testing shows that the heart is healthy.

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