Since days of yore, the main purpose of medicine is the patient care, by recognizing the disease and establishing the therapy, aiming to provide relief or cure when possible. Making diagnosis constitutes the key step to achieve this paradigm. In this setting, the medical diagnosis, a complex task, involves specific knowledge and skills, experience, logical reasoning, information processing and pattern recognition. As time passes, intuition, insights and suspicion are added to this process happening at an unconscious level.