Passing out in most of the cases is related to heart rhythm disorder and not due to some problem in the brain writes Dr Vanita Arora Associate Director & Head Cardiac Electrophysiology Lab and Arrhythmia Services Max Hospital Saket . Fainting followed by blurring of vision black out light-headedness feeling of nausea dizziness should not be passed off as just a mere normal occurrence as all this may be a warning sign of a serious heart ailment. Dizziness is normal after strenuous work but fainting coupled with these signs is abnormal and warrant some seriousness if you are ignoring it. Fainting