When consulting a medical institution, the first place most people approach for an examination is a department or clinic specializing in internal medicine. At the same time, internists —— physicians specializing in internal medicine —— must conduct a comprehensive differential diagnosis process to reach an accurate judgment. However, as a diverse array of symptoms may occur in a patient, the limits of a physician’s experience and knowledge may not encompass diseases with few cases. The Japanese Society of Internal Medicine has published the J-CaseMap case search database to serve as a diagnostic tool. But as this database covers only rare diseases, physicians need to have the ability to distinguish the false from the genuine in the information generated by the AI.