The left bundle branch block seldom causes symptoms on its own. However, in certain situations, you may have symptoms such as dizziness. Fainting. Chest pain. Shortness of breath. People with LBBB are more likely to experience faintings than others. The reason is not clear, but it may be related to increased risk of developing congestive heart failure or arrhythmias. In addition, people with LBBB may require extra attention if they are taking drugs that can cause hypotension (low blood pressure). These include anti-depressants, beta blockers, and calcium channel blockers. Doctors should be made aware of your current medication list before any diagnostic tests are performed so that proper precautions are taken. LBBB is often a sign of other problems too. For example, if you are experiencing shortness of breath when walking up stairs or exercising then this may be due to coronary artery disease. If you are experiencing dizziness or fainting because of LBBB then you should see a doctor so that appropriate treatment can be given.