Symptoms

In most people, bundle branch block doesn't cause symptoms. Some people with the condition don't know they have bundle branch block.

Rarely, signs and symptoms may include fainting (syncope) or feeling as if you're going to faint (presyncope).

When to see a doctor

If you've fainted, see your doctor to rule out serious causes.

If you have heart disease or have been diagnosed with bundle branch block, ask your doctor how often you should have follow-up visits.