Heart Murmur: What It Means and When Tests Are Needed

A heart murmur is an extra or unusual sound heard when blood moves through the heart. Many murmurs are harmless, but some can point to a valve problem or another heart condition that may need further testing.

Overview: What Is a Heart Murmur?

A heart murmur is an extra sound heard through a stethoscope during the heartbeat cycle. Instead of only the usual “lub-dub” sounds, the clinician hears a whooshing or swishing noise caused by blood flow in or around the heart. A murmur itself is not a disease. It is a clue that may be completely harmless or may suggest a heart-related condition that deserves a closer look.

Heart murmurs can occur in children, adults, and older people. Some are called innocent or functional murmurs. These happen when blood flows a little faster than usual through a normal heart and are common in childhood, pregnancy, fever, anemia, or after exercise. Innocent murmurs do not damage the heart and usually do not need treatment.

Other murmurs are abnormal. These may happen when blood flows through a narrowed or leaking valve, across a hole in the heart, or through a heart muscle that has changed shape or function. In these situations, the sound can be a sign of conditions such as heart valve disease or congenital heart defects. The key question is not just whether a murmur is present, but what is causing it.

Symptoms and What a Murmur May Feel Like

Most people do not feel a heart murmur. The murmur is something the doctor hears, not usually something the patient notices. If the murmur is innocent, there are often no symptoms at all, and the person may feel entirely well.

When a murmur is related to an underlying heart problem, symptoms depend on the cause and how much it affects blood flow. Some people may notice shortness of breath, especially during activity or when lying down. Others may feel tired more easily than expected, have reduced exercise tolerance, or feel their heart racing or beating irregularly.

Additional symptoms that may suggest a more significant issue include chest discomfort, dizziness, fainting, swelling in the legs or ankles, or a bluish color of the lips or fingertips. In infants and children, warning signs may include poor feeding, slow weight gain, sweating with feeds, rapid breathing, or unusual sleepiness. These symptoms do not always mean there is a serious problem, but they are reasons to seek medical assessment.

• Many murmurs cause no symptoms.
• Symptoms come from the underlying condition, not the sound itself.
• Shortness of breath, fatigue, chest pain, fainting, or swelling should not be ignored.

Causes and Risk Factors

Heart murmurs happen when blood flow becomes more turbulent than usual. This may occur in a completely normal heart when blood is moving faster, such as during fever, pregnancy, hyperthyroidism, growth spurts, or anemia. In these cases, the murmur may disappear once the body returns to its usual state.

Abnormal murmurs are often linked to heart valve conditions. A valve may be too narrow, known as stenosis, or it may not close properly, known as regurgitation or leakage. Age-related valve changes, calcium buildup, past infection, rheumatic fever, or congenital differences present from birth can all contribute. Murmurs can also occur with thickening of the heart muscle, enlargement of the heart, or holes between heart chambers.

Risk factors depend on the underlying cause. Some congenital murmurs are present early in life. In adults, risk can increase with older age, high blood pressure, previous heart infection, a family history of structural heart disease, or illnesses that affect the heart and circulation. Certain murmurs may be discovered during evaluation for arrhythmia or other cardiovascular concerns, even when the person had not noticed any symptoms before.

When Tests Are Needed

Not every heart murmur requires extensive testing. Clinicians often decide based on the person’s age, symptoms, medical history, and the features of the murmur during examination. A soft murmur in a healthy child or young adult with no symptoms may be monitored without immediate testing. A newly detected murmur in an older adult, or any murmur accompanied by symptoms, usually needs further assessment.

The doctor listens for several details, including when the murmur occurs in the heartbeat cycle, how loud it is, where it is heard best, and whether it travels to the neck or back. Certain patterns are more likely to be harmless, while others suggest valve disease or structural problems. The physical examination may also reveal signs such as fluid retention, abnormal pulses, cyanosis, or an enlarged heart.

Tests are commonly recommended when the murmur is loud, persistent, associated with symptoms, or found in someone with known heart disease or risk factors. Testing helps answer practical questions: Is the heart structure normal? Are the valves opening and closing properly? Is blood flow blocked or leaking? The goal is to identify whether the murmur is innocent or whether it reflects a condition that should be monitored or treated.

How Heart Murmurs Are Diagnosed

The most important test for a suspected abnormal heart murmur is an echocardiogram. This is an ultrasound of the heart that shows the heart chambers, valves, and blood flow in real time. It can reveal narrowing, leakage, congenital abnormalities, and changes in heart muscle function. In many cases, it is the test that confirms whether the murmur is harmless or caused by a structural problem.

Other tests may be used depending on the situation. An electrocardiogram records the heart’s electrical activity and can show rhythm problems or evidence of strain on the heart. A chest X-ray may provide information about heart size or fluid in the lungs. Blood tests can help check for anemia, thyroid disorders, or infection if these are possible contributors. In some people, exercise testing or advanced imaging may be needed.

If the murmur suggests a valve issue, the care team may discuss whether ongoing follow-up is needed and how often repeat imaging should be done. When planning treatment, a specialist may also use more detailed imaging and catheter-based evaluation. In hospitals with advanced cardiac programs, diagnosis and treatment planning may involve cardiology evaluation and imaging that help define the best next step for each patient.

Treatment Options and Follow-Up

Treatment for a heart murmur depends entirely on its cause. Innocent murmurs do not need treatment and often only require reassurance. If the murmur is due to a temporary condition such as fever, dehydration, pregnancy, or anemia, management focuses on that issue rather than the murmur itself.

When a murmur is linked to heart valve disease or another structural problem, treatment may range from regular monitoring to medication or a procedure. Medicines may be used to reduce symptoms, control blood pressure, manage fluid buildup, or treat rhythm problems, but medicines do not fix every valve problem. In some cases, especially when symptoms develop or the heart begins to struggle, repair or replacement of a valve may be recommended.

Depending on the diagnosis, options may include catheter-based or surgical treatment. For selected patients, the care plan may involve heart valve surgery or another intervention tailored to the specific valve and overall heart function. If the murmur is related to a congenital defect or another cardiac condition, treatment is individualized and may involve careful long-term follow-up with a heart specialist.

Prevention, Self-Care, and Living With a Heart Murmur

Because a heart murmur is a sign rather than a single disease, prevention focuses on heart health and on reducing the risk of conditions that can affect the valves or heart muscle. Regular checkups, blood pressure control, diabetes management, and not smoking all support cardiovascular health. Prompt treatment of infections and attention to symptoms can also help prevent complications in people with known heart conditions.

For people with an innocent murmur, daily life is usually normal. They can generally exercise, work, and travel without restrictions unless a clinician advises otherwise. For those with an abnormal murmur, activity recommendations depend on the underlying diagnosis and symptom level. It is helpful to ask the care team whether there are any limits on exercise, pregnancy planning, or dental and surgical procedures.

Self-care includes taking prescribed medicines as directed, attending follow-up appointments, and reporting any changes such as new shortness of breath, chest discomfort, swelling, or fainting. Some patients with significant structural disease may also benefit from care that overlaps with cardiovascular surgery teams if a procedure becomes necessary. Near the end of the care journey, patients often find reassurance in multidisciplinary assessment; Acibadem International’s specialists in JCI-accredited hospitals diagnose and treat heart conditions for international patients when advanced evaluation or treatment is needed.

When to See a Doctor

A person should see a doctor if a heart murmur is newly discovered, especially in adulthood, or if there are symptoms such as breathlessness, chest pain, palpitations, dizziness, fainting, or leg swelling. Parents should arrange medical review if a child has a murmur along with poor feeding, slow growth, blue lips, or tiring easily with activity.

Urgent care is important if severe shortness of breath, chest pain, fainting, or sudden worsening of symptoms occurs. These symptoms do not always mean the murmur is the cause, but they deserve prompt evaluation. A clinician can determine whether the murmur is innocent, whether tests are needed, and whether specialist care should be arranged.

Even when no immediate treatment is needed, a clear diagnosis can be valuable. Knowing whether a murmur is harmless or linked to a heart condition helps guide follow-up, lifestyle decisions, and future medical care. Early assessment can also reduce uncertainty and support timely treatment if a problem is found.

Frequently asked questions

Is a heart murmur always serious?

No. Many heart murmurs are innocent, especially in children, young adults, and during situations like pregnancy or fever. A murmur becomes more concerning when it is linked with symptoms or caused by a valve or structural heart problem.

Can a heart murmur go away on its own?

Yes, some can. Innocent murmurs may become less noticeable over time, and murmurs related to temporary conditions such as fever or anemia may improve when the underlying issue is treated. Murmurs caused by valve disease usually do not go away without specific management.

What test is most commonly used for a heart murmur?

The main test is an echocardiogram, which is an ultrasound scan of the heart. It shows how the valves and chambers are working and helps identify whether the murmur is harmless or caused by a structural problem.

Can someone exercise if they have a heart murmur?

Often yes, especially if the murmur is innocent and there are no symptoms. If the murmur is caused by heart disease, exercise advice should be individualized based on the diagnosis, severity, and overall heart function.

Do children with heart murmurs always need treatment?

No. Many children have innocent murmurs that do not require treatment and do not affect growth or activity. Treatment is only needed when tests show an underlying heart condition that should be monitored or corrected.

Can a heart murmur be detected before symptoms appear?

Yes. A heart murmur is often first found during a routine physical examination before a person notices any symptoms. This is one reason regular checkups can be helpful, especially for children and older adults.

References

• American Heart Association
• National Heart, Lung, and Blood Institute
• Mayo Clinic
• European Society of Cardiology

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.