In general, bundle branch block is a common disorder that many people will never realize they have. Right bundle branch block typically only results from a medical condition that affects the right side of either the heart or the lungs. If a doctor discovers right bundle branch block, they will immediately look for other conditions such as cardiomyopathy, heart attacks, or heart disease. It is possible for right bundle branch block to develop in perfectly healthy individuals. Left bundle branch block is typically a sign of an underlying heart condition.

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