Expert Systems and robotics are the main area of Artificial Intelligence for Medial sciences. The Robotics will assist the Doctor in Surgery. The Medical Expert Systems will assist the Doctor in Diagnosis. The information available to the medical diagnosis is incomplete. The medical diagnosis needs commonsense. The fuzzy logic deals incomplete information with commonsense (belief) rather than likelihood (probability). The neural networks are used to learn the fuzzy rules of Medical Diagnosis. In these paper fuzzy neural networks are studied to learn fuzzy rules of medical diagnosis for incomplete information. Some methods of fuzzy conditional inferences are studied. The fuzzy medical expert systems is discussed for medical diagnosis. The two fold fuzzy sets is discussed for medical diagnosis.The EMYCIN is medical expert system shell is discussed for Children Eye diagnosis as an example.