Jun 11, 2022 · 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, symptoms of …

Left bundle branch block occurs when there’s a disruption to the electrical impulse that controls your heartbeat. A pacemaker or CRT can help control symptoms.

Left bundle branch block (LBBB) may not be serious if you do not have any underlying heart conditions. Many people with LBBB have no symptoms, and some don’t require any treatment …

Sep 3, 2025 · Most people with LBBB don't experience symptoms, but some feel breathless or fatigued. If your healthcare provider diagnoses LBBB, treatment such as a pacemaker may be …

Jun 19, 2025 · Impulses, or electrical signals, travel through both the left and right chambers of your heart to make it pump. But if the pathway is blocked, the impulses may move slower than …

Mar 1, 2024 · In patients with heart failure, LBBB can make shortness of breath and fatigue worse. Some patients experience fainting or the feeling of nearly fainting, though these …

In left bundle branch block, there is a problem with the left branch of the electrical conduction system. The electrical signal can’t travel down this path the way it normally would. The signal …

Jan 8, 2026 · Learn what bundle branch block means, what causes it, and how it's diagnosed and managed—plus when symptoms like fainting or fatigue need urgent care.

Left Bundle Branch Block (LBBB) is a heart issue. It happens when electrical signals get delayed or blocked on the left side of the heart. This makes the heart work less efficiently. LBBB is …

Dec 18, 2025 · LBBB may not always present noticeable symptoms, but when it does, they can include: Shortness of Breath: Difficulty breathing, especially during physical activity. Fatigue: …