Banner Health
Making healthcare easier
INSTALL

Causes and Signs of Congenital Heart Defects

Congenital heart defects (CHDs) are problems with the heart’s structure that a person is born with. These defects can affect how blood flows through the heart and to the rest of the body. Understanding the causes and signs of CHDs can help families recognize concerns early and get the right care. 

At Banner Health, our heart specialists care for people of all ages with congenital heart defects. We’re here to help you understand these conditions and support you or your child at every stage of care. 

Causes of congenital heart defects 

Congenital heart defects occur when something affects how a baby’s heart develops during pregnancy. Most CHDs form in the first six weeks of pregnancy, when the heart is still developing. 

In many cases, the exact cause of a heart defect is unknown. Some CHDs are inherited or linked to genetic changes. If a parent or close family member was born with a heart defect, the risk may be higher. 

Certain genetic or chromosomal conditions, such as Down syndrome, are also commonly associated with congenital heart defects and can affect how the heart forms. 

Factors that may increase the risk of congenital heart defects 

Lifestyle and environmental exposures 

Some exposures during pregnancy may raise the risk of heart defects, including: 

  • Drinking alcohol 
  • Smoking 
  • Using opioids or other non-prescribed drugs 
  • Exposure to high levels of pollution or radiation 

If you are pregnant and smoke or drink alcohol, talk with your health care provider about support to help you quit. 

Certain medications 

Some medications taken during pregnancy can affect heart development, including: 

  • Certain anti-seizure medications 
  • Lithium used to treat depression 
  • Some acne medications 
  • Certain medications for high blood pressure or cholesterol 

Do not start or stop any prescription medication before or during pregnancy without guidance from your health care provider. 

Health conditions during pregnancy 

Some health conditions may increase the risk of CHDs, such as: 

  • Type 1 or type 2 diabetes 
  • Lupus 
  • Phenylketonuria (PKU) 
  • Rubella (German measles) 
  • Influenza during the first trimester 

Your provider can help you manage health conditions and stay up to date on recommended vaccinations. 

Poor nutrition 

Low levels of key nutrients, including folic acid, during pregnancy may contribute to heart defects. 

Your provider can recommend appropriate prenatal vitamins before, during and after pregnancy. 

Signs and symptoms of congenital heart defects 

Many congenital heart defects are found before birth or shortly after delivery. Some signs may not appear until infancy, childhood or even adulthood. Symptoms can vary based on age and the type of defect. 

Infants (0 to 1 year) 

Because babies are small, heart problems can affect them more quickly. Watch for: 

  • Rapid breathing, even at rest 
  • Cyanosis, a bluish tint to the skin, lips or fingernails 
  • Poor feeding or tiring easily during feedings 
  • Slow weight gain 
  • Excessive sweating, especially while feeding 

Toddlers (1 to 3 years) 

Signs may become subtler as children grow, including: 

  • Getting tired easily during play 
  • Shortness of breath with activity 
  • Poor growth 
  • Frequent respiratory infections 
  • Pale or bluish skin 

School-age children (4 to 12 years) 

Symptoms may become more noticeable during activity: 

  • Trouble keeping up with peers 
  • Chest pain during exercise 
  • Dizziness or fainting 
  • Heart murmurs found during routine exams 
  • Swelling in the legs, abdomen or around the eyes 

Teenagers and adults (13 years and older) 

Older children and adults with CHDs may experience: 

  • Reduced exercise tolerance 
  • Heart palpitations 
  • Shortness of breath with activity 
  • Ongoing fatigue 
  • Swelling in the feet, ankles or abdomen 

If you or your child experience any of these signs at any age, talk with a health care provider. Early diagnosis and treatment can help prevent complications and support long-term heart health. 

How congenital heart defects are diagnosed 

If a congenital heart defect is suspected based on symptoms, family history or prenatal screening, your health care provider may recommend tests to confirm the diagnosis and understand how the heart is affected. Early and accurate diagnosis helps guide treatment and long-term care. 

Learn more about how congenital heart defects are diagnosed. 

Why choose Banner Health for congenital heart defect care 

Our heart specialists at Banner Health diagnose and treat a wide range of congenital heart defects, from common conditions to rare and complex cases. We take an individualized approach to care, creating treatment plans based on each patient’s needs, age and overall health. 

Whether care is needed in infancy, childhood or adulthood, our teams are here to support lifelong heart health. 

Schedule an appointment for congenital heart defect care at Banner Health.