There are risk factors that increase your chances of developing a heart murmur, including:

  • Family history of a heart defect. If blood relatives have had a heart defect, that increases the likelihood you or your child may also have a heart defect and heart murmur.
  • Certain medical conditions, including uncontrolled high blood pressure (hypertension), hyperthyroidism, an infection of the lining of the heart (endocarditis), high blood pressure in the lungs (pulmonary hypertension), carcinoid syndrome, hypereosinophilic syndrome, systemic lupus erythematosus, rheumatoid arthritis, a weakened heart muscle or a history of rheumatic fever, can increase your risk of a heart murmur later in life.

Factors that increase your baby's risk of developing a heart murmur include:

  • Illnesses during pregnancy. Having some conditions during pregnancy, such as uncontrolled diabetes or a rubella infection, increases your baby's risk of developing heart defects and a heart murmur.
  • Taking certain medications or illegal drugs during pregnancy. Use of certain medications, alcohol or drugs can harm a developing baby, leading to heart defects.
April 03, 2015