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Thyrotoxicosis is a common condition that is associated with cardiovascular complications. The most common complications that occurs are heart failure and cardiac arrhythmias. Cardiac arrhythmias due to thyrotoxicosis negatively affect the cardiovascular system at the cellular and molecular levels. The commonest cardiac arrhythmias are sinus tachycardia and atrial fibrillation. Left bundle branch block as a presentation of thyrotoxicosis is rare. We are reporting a case of a patient with a transient left bundle branch block as a thyrotoxicosis manifestation that was resolved after the thyroid status was normalized.