A “soplo” is the Spanish word for a heart murmur, an extra whooshing or swishing sound that a doctor hears when listening to your heart with a stethoscope. It’s caused by turbulent blood flow inside the heart or through nearby blood vessels. A soplo is not a disease on its own. It’s a sound that can be completely harmless or, in some cases, a clue that something in the heart needs attention.
If a doctor told you or your child has a soplo, the most important thing to understand is that many heart murmurs are innocent, meaning they don’t signal any problem at all. Here’s what determines whether a soplo is something to worry about and what happens next.
Why the Heart Makes This Sound
Blood normally flows smoothly through the heart’s four chambers and valves. When that flow speeds up or hits an obstacle, it becomes choppy and turbulent, producing a sound your doctor can pick up through a stethoscope. Think of it like water flowing quietly through a garden hose versus the noise it makes when you partially block the opening with your thumb.
That turbulence can happen for many reasons. Some are structural: a valve that doesn’t open fully, a valve that leaks, or a small hole between heart chambers that was present at birth. Others are purely temporary: your blood is flowing faster than usual because of a fever, pregnancy, anemia, or vigorous exercise. Once the temporary condition resolves, the sound disappears.
Innocent vs. Abnormal Murmurs
Doctors split heart murmurs into two categories. Understanding which type you have changes everything about what it means for your health.
Innocent murmurs are harmless sounds made by blood circulating normally through the heart. They don’t involve any structural defect. These are extremely common in children. Up to 72% of children will have a detectable murmur at some point during childhood or adolescence, and most of these resolve on their own by adulthood. Innocent murmurs are also called “functional” or “physiologic” murmurs. They need no treatment and no lifestyle changes.
Abnormal murmurs point to an underlying heart condition. In adults, these are most often related to defective heart valves, whether a valve has become too narrow (stenosis), is leaking backward (regurgitation), or was malformed from birth. In children, abnormal murmurs are more commonly tied to congenital heart defects like holes between heart chambers.
Doctors gather clues about which type of murmur they’re hearing based on its loudness, its location on the chest, its quality (harsh, blowing, rumbling), and when it occurs during the heartbeat cycle. Murmurs heard during the relaxation phase of the heartbeat (diastole) always warrant further investigation, since they consistently point to a structural change in the heart. Murmurs heard during the pumping phase (systole) can go either way.
How Doctors Grade a Soplo
Doctors rate the loudness of a murmur on a scale from 1 to 6:
- Grade 1: Barely audible, requires special effort to hear
- Grade 2: Soft but detectable
- Grade 3: Easily heard, but no vibration felt on the chest
- Grade 4: Loud, with a vibration (called a “thrill”) that the doctor can feel with their hand on your chest
- Grade 5: Very loud, audible with the stethoscope barely touching the skin
- Grade 6: So loud it can be heard with the stethoscope held just above the chest, not touching it
A higher grade doesn’t automatically mean a more dangerous problem, but grades 4 and above almost always prompt further testing. Innocent murmurs in children are typically grade 1 or 2.
Symptoms That Suggest a Problem
Most people with a soplo feel nothing at all. The sound is discovered during a routine exam. When an abnormal murmur is caused by a significant heart condition, though, symptoms may develop over time. These include shortness of breath, chest pressure or pain, swelling in the ankles or feet, heart palpitations (a fluttering sensation), unusual fatigue, fainting, and in more serious cases, a bluish tint to the skin (especially in infants).
In children, poor weight gain, difficulty feeding, or turning blue during crying or activity can be signs that the murmur reflects a congenital heart problem that needs treatment.
How a Soplo Is Diagnosed
Hearing the murmur with a stethoscope is the first step, but it doesn’t tell the full story. If a doctor suspects the murmur may be abnormal, the main test they’ll order is an echocardiogram. This is an ultrasound of the heart. It uses sound waves to create a moving picture of your heart’s chambers, valves, and blood flow in real time. It’s painless, involves no radiation, and takes about 30 to 60 minutes.
The echocardiogram can show exactly what’s causing the turbulence: a narrowed valve, a leaking valve, a hole in the wall between chambers, or thickened heart muscle. It also reveals how well the heart is pumping overall. In many cases, this single test is enough to confirm whether the murmur is innocent or requires treatment.
Treatment Depends on the Cause
Innocent murmurs need no treatment whatsoever. Your doctor may note it in your chart and listen for it at future checkups, but there are no restrictions on activity, diet, or anything else.
When a murmur is caused by an underlying condition, treatment targets that condition, not the sound itself. For mild valve problems, doctors often recommend lifestyle adjustments like reducing salt intake, staying active, limiting alcohol, and maintaining a healthy weight. These steps help reduce the workload on the heart.
If the underlying problem is more significant, medications can help manage symptoms and protect the heart. These might include drugs to lower blood pressure, reduce fluid buildup, prevent blood clots, or control heart rate.
For valve problems that progress despite medication, procedures or surgery may become necessary. Options range from less invasive approaches, like threading a catheter through a vein to open a stiff valve with a balloon, to valve repair or full valve replacement. Replacement valves come in two types: tissue valves made from animal or human tissue, which don’t require long-term blood thinners but wear out over time, and mechanical valves made from synthetic materials, which last longer but require lifelong blood-thinning medication. For patients who aren’t good candidates for open-heart surgery, catheter-based valve replacement offers a lower-risk alternative.
Soplos in Children
Finding out your child has a soplo can be alarming, but the odds are strongly in your favor. Given that nearly three-quarters of children have a detectable murmur at some point during their growth, the vast majority are innocent. Children’s hearts are smaller and their chest walls are thinner, which makes normal blood flow sounds easier to pick up with a stethoscope.
Pediatricians can often tell the difference between an innocent and abnormal murmur just by listening. Innocent childhood murmurs have a distinctive soft, musical quality. They tend to get louder when a child has a fever or is excited and quieter when the child is calm. If there’s any uncertainty, an echocardiogram settles the question quickly. Most children with innocent murmurs outgrow them entirely, and many parents never hear about it again after the initial mention.