Narrative medical visualization bridges the gap between limited health literacy and the need for health communication. We explore disease stories to promote preventive behaviors, educate patients about their conditions and treatment options to foster informed consent, which is embraced by clinicians for its potential to alleviate the burden on healthcare systems and providers. We integrate data visualization with storytelling to make scientific information more accessible to diverse audiences. However, the expansive design space presents significant challenges, as design choices can greatly influence levels of engagement, memorability, and comprehension. Our work investigates the fundamental dimensions of the narrative design space - conflict, content, character, and structure - with the aim of maximizing its impact on disease communication.