A heart murmur is caused by the flow of blood through the heart. Some heart murmurs are normal, while some occur with heart disease.

Causes of heart murmurs include:

• Anemia
• Aortic regurgitation
• Aortic stenosis
• Atrial septal defect
• Bacterial endocarditis
• Hypertrophic cardiomyopathy
• Mitral regurgitation
• Mitral stenosis
• Mitral valve prolapse
• Pregnancy
• Pulmonary embolus
• Pulmonic stenosis
• Rheumatic fever
• Tricuspid insufficiency
• Ventricular septal defect