A heart murmur is an additional sound heard during a heartbeat, often described as a whooshing or swishing noise. It is usually detected when a doctor listens to the heart using a stethoscope during a routine medical examination.
Although heart murmurs are not always a sign of heart disease, some may indicate an underlying problem affecting the heart valves or its structure. Understanding what causes heart murmurs in adults and when further evaluation may be necessary can help individuals make informed decisions about their cardiovascular health.
Understanding Heart Murmurs in Adults
A healthy heart has four valves that open and close to maintain blood flow in the correct direction. A heart murmur occurs when blood flows turbulently through the heart or its surrounding structures, producing an additional sound.
Heart murmurs are generally classified into two categories:
- Innocent heart murmurs: These occur without an underlying structural heart abnormality. They may be associated with increased blood flow during exercise, pregnancy, fever or conditions such as anaemia.
- Abnormal heart murmurs: These may indicate structural changes affecting the heart, particularly its valves. For example, a valve may become narrowed or fail to close properly, disrupting normal blood flow.
A murmur is a clinical finding rather than a diagnosis. Its significance depends on the characteristics of the sound, the individual’s medical history and whether other symptoms or examination findings are present.
When to Evaluate Heart Murmurs
Not every heart murmur requires extensive investigation. However, certain findings may suggest that a more detailed cardiovascular assessment is appropriate.
A doctor may recommend further evaluation in the following situations:
- A newly detected murmur: A murmur identified for the first time in adulthood may warrant further examination to establish its cause.
- Changes in an existing murmur: A noticeable change in its intensity or characteristics may require reassessment.
- Associated cardiovascular symptoms: Breathlessness, chest discomfort, dizziness or reduced exercise tolerance may suggest an underlying heart condition.
- Existing heart conditions: Individuals with known heart valve disease, congenital heart abnormalities or other structural heart problems may require ongoing evaluation.
For individuals with these concerns, an assessment at a cardiology clinic in Singapore may help clarify whether a murmur is associated with an underlying cardiovascular condition and whether further investigations are needed.
The decision to proceed with specialist evaluation depends on the individual’s symptoms, clinical findings and overall health.
When to Worry About Heart Murmurs
One important consideration is whether a heart murmur occurs alongside symptoms that may indicate changes in heart function.
Some heart valve conditions develop gradually and may not cause noticeable symptoms in their early stages. As the condition progresses, the heart may need to work harder to maintain blood circulation.
Warning signs that require medical attention include:
- Shortness of breath: Difficulty breathing during routine activities or while resting may indicate an underlying cardiovascular problem.
- Chest discomfort: Pressure, tightness or pain in the chest may require further investigation.
- Dizziness or fainting: These symptoms can occur when certain heart conditions affect blood flow.
- Persistent fatigue: Unusual tiredness or reduced ability to perform everyday activities may be associated with changes in heart function.
- Swelling in the lower limbs: Fluid accumulation around the ankles or legs can sometimes indicate an underlying heart condition.
These symptoms can arise from several medical conditions and do not necessarily mean that a heart murmur is dangerous.
However, severe chest pain, sudden breathing difficulties or loss of consciousness require immediate emergency medical attention.
What Conditions Can Cause Abnormal Heart Murmurs?
In adults, abnormal heart murmurs are frequently associated with changes in the heart valves. These valves regulate the direction of blood flow as the heart pumps.
Two conditions commonly associated with heart murmurs are:
Heart Valve Stenosis
Valve stenosis occurs when a heart valve becomes narrowed or stiff, restricting blood flow through the valve opening.
Aortic stenosis, for example, affects the valve that controls blood leaving the heart for the rest of the body. It may develop as calcium deposits accumulate on the valve with age.
As the narrowing becomes more significant, the heart may experience increased strain.
Heart Valve Regurgitation
Valve regurgitation occurs when a valve does not close completely, allowing some blood to flow backwards instead of continuing in the intended direction.
This may affect the mitral or aortic valve and can vary in severity. Some individuals experience no symptoms, while others may develop breathlessness, fatigue or other cardiovascular concerns.
Other possible causes of abnormal heart murmurs include congenital heart abnormalities, certain heart muscle conditions and infections affecting the heart valves.
Identifying the underlying cause is important because different conditions may require different approaches to monitoring and treatment.
How Is a Heart Murmur Assessed?
When a heart murmur is detected, a doctor will first consider the individual’s symptoms, medical history and findings from a physical examination.
The timing, location, pitch and intensity of the murmur can provide clues about its possible cause. However, listening to the heart alone may not be sufficient to determine whether a structural abnormality is present.
If further investigation is clinically indicated, an echocardiogram may be recommended.
An echocardiogram uses ultrasound to produce images of the heart, allowing doctors to examine its chambers, valves and pumping function. It can also help identify narrowed or leaking valves.
Additional investigations may be considered depending on the findings and the presence of other symptoms.
The purpose of these assessments is to establish whether the murmur is harmless, requires periodic monitoring or is associated with a condition that needs medical treatment.
Does Every Heart Murmur Need Treatment?
A heart murmur does not automatically require medication or a medical procedure. Management depends on the underlying cause and whether the heart’s function is affected.
For innocent heart murmurs, specific treatment is generally unnecessary.
If a murmur is associated with mild heart valve disease, a doctor may recommend periodic follow-up appointments to monitor the condition. This is particularly relevant because some valve abnormalities can progress without causing immediate symptoms.
For more significant abnormalities, treatment may involve medications to manage associated symptoms or cardiovascular conditions. In selected cases, procedures to repair or replace an affected heart valve may be considered.
Individuals who have been diagnosed with a heart murmur should follow their doctor’s recommendations and report any new or worsening symptoms.
Heart murmurs in adults can have several possible causes, ranging from harmless changes in blood flow to structural abnormalities affecting the heart valves. While many murmurs do not require treatment, newly detected or changing murmurs may warrant further evaluation, particularly when accompanied by cardiovascular symptoms.
Understanding when to evaluate heart murmurs can help individuals recognise changes that deserve medical attention. A clinical assessment can help determine the underlying cause and whether monitoring, additional investigations or treatment is appropriate.
For adults in Singapore, discussing a newly detected heart murmur with a healthcare professional and attending recommended follow-up appointments can support informed decisions about long-term cardiovascular health.
