A heart murmur by itself does not cause chest pain. A murmur is simply the sound of turbulent blood flow through the heart, picked up by a stethoscope. It’s not a disease. But the underlying condition causing a murmur, such as a narrowed valve or thickened heart muscle, can absolutely produce chest pain. So when chest pain and a heart murmur show up together, the pain is coming from the structural or functional problem behind the murmur, not the murmur itself.
Innocent Murmurs vs. Abnormal Murmurs
About 10 percent of adults and 40 to 45 percent of children have a heart murmur at some point. The vast majority are “innocent” murmurs, meaning they’re caused by normal changes in blood flow with no structural heart problem. Things like exercise, fever, pregnancy, anemia, an overactive thyroid, or the rapid growth spurts of adolescence can all speed up blood flow enough to create an audible murmur. These innocent murmurs don’t cause chest pain or any other symptoms, and they typically don’t need treatment.
Abnormal murmurs are different. They result from actual problems with the heart’s structure: a valve that’s too narrow, a valve that leaks, a hole between heart chambers, or a thickened heart wall. These are the murmurs that can come with chest pain, shortness of breath, dizziness, or fainting, because the heart is working harder than it should or not delivering blood efficiently.
How Valve Problems Lead to Chest Pain
The most common valve-related cause of chest pain alongside a murmur is aortic stenosis, a narrowing of the valve that controls blood flow from the heart to the rest of the body. It’s the most common valve disease in the developed world. The narrowed opening forces the heart to pump much harder to push blood through, and over time the heart muscle thickens to compensate. That thicker muscle demands more oxygen, but the coronary arteries can’t increase their supply enough to keep up. The result is chest pain, especially during physical activity, when the heart’s oxygen demand spikes.
Research on patients with critical aortic stenosis found that even without any blockages in the coronary arteries, their hearts showed signs of oxygen starvation. Blood flow to the heart muscle barely increased under stress, and the tissue had to switch to less efficient energy pathways just to keep functioning. This is why people with severe aortic stenosis can experience chest pain that feels similar to a heart attack, even though their arteries are clear.
Mitral Valve Prolapse
Mitral valve prolapse, where one of the heart’s valves bulges slightly backward when it closes, is another common source of both a murmur and chest pain. The chest pain from this condition tends to be different from the classic squeezing or pressure that people associate with heart disease. It’s often sharp or stabbing, can come and go unpredictably, and isn’t always tied to exertion. According to Johns Hopkins Medicine, the pain can be recurrent and sometimes debilitating, even though it isn’t dangerous in the way that coronary artery disease is. The exact reason mitral valve prolapse causes pain isn’t fully understood, but it’s a frequent complaint among people with the condition.
Thickened Heart Muscle and Chest Pain
Hypertrophic cardiomyopathy is a condition where the heart muscle becomes abnormally thick, often in the wall separating the two lower chambers. In many people, the thickened muscle partially blocks the flow of blood leaving the heart, which creates a murmur. This obstruction also forces the heart to work harder and can reduce blood supply to the muscle itself, leading to chest pain during exercise, shortness of breath, dizziness, and fainting. This condition is one of the more serious causes of a murmur with chest pain, particularly in younger people and athletes.
Heart Murmurs and Chest Pain in Children
Most childhood murmurs are innocent and tied to normal growth or temporary conditions like fever. When a child has both a murmur and chest pain, though, the concern shifts to possible congenital heart defects: structural problems present from birth. These can include holes between heart chambers (septal defects) or abnormalities in the valves. In infants and young children, warning signs go beyond chest pain to include poor appetite, failure to gain weight, and bluish discoloration of the lips or fingernails.
That said, chest pain in children is very common and usually not heart-related. Muscle strain, growing pains, acid reflux, and anxiety account for the majority of cases. A pediatric cardiologist can sort out whether a child’s murmur and chest pain are connected or coincidental.
Warning Signs That Need Prompt Attention
If you’ve been told you have a heart murmur, certain symptoms alongside chest pain suggest the underlying cause is serious and needs evaluation soon:
- Shortness of breath with mild activity or while lying down
- Fainting or near-fainting, especially during exercise
- Heavy sweating with little or no physical effort
- Swelling in the legs, ankles, or abdomen, or sudden unexplained weight gain
- Blue or gray tint to fingernails or lips
- Swollen neck veins
- A persistent cough that won’t resolve
Any of these alongside a known murmur points to a heart that’s struggling to keep up with the body’s demands.
How the Cause Gets Diagnosed
When a murmur and chest pain occur together, the primary tool for figuring out what’s going on is an echocardiogram, an ultrasound of the heart. It shows the heart’s valves in real time, reveals how blood is flowing through each chamber, and can identify thickened walls, narrowed valves, leaking valves, or holes. It’s painless and takes about 30 to 60 minutes.
Depending on what the echocardiogram shows, additional testing might include an electrocardiogram (ECG) to check the heart’s electrical activity, a chest X-ray to see if the heart is enlarged, or in some cases a cardiac MRI or CT scan for more detailed images. Cardiac catheterization, where a thin tube is threaded into the heart through a blood vessel, is reserved for situations where less invasive tests haven’t provided a clear answer or when an intervention is being planned.
The key point is that a murmur paired with chest pain is a signal to look deeper. The murmur is the clue, not the culprit. Identifying and treating whatever structural issue is generating the turbulent flow is what resolves the symptoms.