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Pregnancy places extraordinary demands on the cardiovascular system and can be the first time previously undiagnosed heart valve disease becomes apparent. A Mayo Clinic cardio-obstetrics specialist says understanding when common pregnancy symptoms may signal an underlying heart condition is important for clinicians caring for expectant mothers.
Often described as the body’s “ultimate cardiovascular stress test,” pregnancy increases blood volume, raises heart rate, and lowers vascular resistance to support both the mother and the developing baby. According to Mayo Clinic, these normal physiologic changes can unmask previously silent heart valve disease or intensify symptoms in women with known valve conditions, as the heart is asked to move more blood through a valve that is not functioning normally.
Because many symptoms of heart valve disease overlap with normal pregnancy symptoms, distinguishing between expected physiologic changes and signs of underlying cardiac disease can be challenging for clinicians caring for pregnant patients.
“Valve disease affects how blood moves through the heart, and pregnancy is often a time when symptoms first appear or become more noticeable,” said Katie Young, M.D., a cardio-obstetrics specialist at Mayo Clinic in Rochester, Minnesota.
Why Pregnancy Can Uncover Heart Valve Disease
During pregnancy, the heart works significantly harder to support both the mother and the developing baby. Blood volume expands, vascular resistance drops, and heart rate increases. These normal physiologic changes begin early in pregnancy and peak during the late second to early third trimester.
These physiologic changes can expose valve disease that previously caused few or no symptoms.
Valve disease may involve narrowed valves (stenosis), leaky valves (regurgitation), or congenital valve abnormalities. Other valve conditions may result from infections, such as rheumatic fever, or changes in the valve’s structure over time.
When Common Pregnancy Symptoms Deserve a Closer Look
Many symptoms associated with heart valve disease also occur during a healthy pregnancy, making assessment more challenging.
Although fatigue, shortness of breath, swelling, and a faster heart rate can be normal during pregnancy, Mayo Clinic advises that symptoms that begin suddenly or worsen significantly should be evaluated.
According to Young, shortness of breath during activity or while lying flat, unusual fatigue that affects daily routines, swelling in the legs or feet, a racing heartbeat, reduced exercise tolerance, and chest pressure should prompt a conversation with a clinician.
“Many patients assume new symptoms are simply part of pregnancy, especially if previous pregnancies were uncomplicated. But when something feels off, listening to that instinct is important,” Young said.
An evaluation may include a physical examination, an echocardiogram to assess heart structure and function, an electrocardiogram to assess heart rhythm, and additional imaging or testing when appropriate to determine whether symptoms are related to pregnancy or an underlying cardiac condition.
A Multidisciplinary Approach to Care
Once valve disease is identified, Mayo Clinic says many patients benefit from a heart team that includes specialists in cardiology and maternal-fetal medicine, with support from cardiac surgery or structural heart experts when needed. Local obstetric teams may also remain involved, particularly if delivery is expected to occur closer to home.
According to Mayo Clinic, this collaborative approach helps align medical needs with a patient’s pregnancy goals and family planning decisions through shared decision-making.
Treatment Depends on the Severity of the Disease
Treatment depends on the severity of valve disease and how well a patient tolerates the physiologic demands of pregnancy.
Many women with mild or moderate valve disease can continue pregnancy safely with close monitoring. Medications may be used to manage fluid retention, control heart rate, or reduce symptoms.
For women with more severe disease or symptoms that significantly affect daily life, procedures may be performed before or during pregnancy. These include catheter-based procedures to widen a narrowed valve or improve valve function, valve repair when possible, and valve replacement when disease is advanced or symptoms cannot be controlled.
For women who require valve replacement, care teams discuss the differences between mechanical and tissue valves, particularly for those planning future pregnancies. Mechanical valves are durable but require lifelong anticoagulation, which can complicate pregnancy. Tissue valves generally avoid long-term blood thinners but have a shorter lifespan.
When Symptoms Should Prompt Further Evaluation
Pregnancy can make it difficult to distinguish normal physiologic changes from signs of underlying heart disease. Mayo Clinic advises expectant mothers to contact a clinician if symptoms such as shortness of breath, difficulty breathing while lying flat, chest discomfort, palpitations, rapidly increasing swelling, or new fatigue begin to interfere with daily life.
“When something doesn’t feel right, speaking up is one of the most important steps a patient can take,” Young said. “A strong care team is ready to help navigate each stage of pregnancy to safely support the health of both the patient and the baby.”
