The chapter underscores succinate dehydrogenase (SDH) as a pivotal enzyme fundamental to cellular life, tracing its historical evolution and structural intricacies. Its central role in the Krebs cycle, efficiently converting succinate to fumarate, is pivotal for electron transport chain function and ATP production. Regulation of SDH activity is crucial for cellular health maintenance. Beyond its metabolic role, SDH dysfunction is linked to various diseases like hereditary paraganglioma–pheochromocytoma syndrome, leiomyomatosis and neurodegeneration, opening avenues for further investigation. Understanding how mutations or altered SDH activity contribute to these conditions can inform novel therapeutic approaches. In summary, SDH transcends its metabolic function, offering rich potential for future research and therapeutic development. Further exploration promises insights into healthcare pathways and a deeper comprehension of cellular dynamics. SDH’s complexity and significance ensure ongoing intrigue and inspiration in scientific pursuits.