What causes a bundle branch block?

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What causes a bundle branch block?

Conditions that can cause a bundle branch block include:

  • Congenital heart disease.
  • Dilated cardiomyopathy.
  • Heart attack (myocardial infarction).
  • Heart disease (coronary artery disease).
  • Heart failure.
  • Heart infection (myocarditis).
  • Heart valve disease.
  • High blood pressure (hypertension).
  • Hypertrophic cardiomyopathy.
  • Weakened or stiffened heart muscle (cardiomyopathy).

Right bundle branch block may also result from lung diseases including:

  • Chronic obstructive pulmonary disease (COPD).
  • Pulmonary embolism.
  • Pulmonary hypertension (PH).

Sometimes, a bundle branch block has no known cause. It can happen in people whose hearts otherwise function normally and who have no underlying conditions.

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