This paper describes the design of a desktop based intelligent tutoring system for teaching diabetes to the student to overcome the difficulties they face. Intelligent Tutoring Systems purposed to provide immediate and customized instruction or feedback to learners. One of a teacher jobs is preparing materials to the students then explaining it, this system will save time for teachers and students, and they can reach it when and where they want to, so it will help individualized learning. This system supports the concept of recent health strategy, skilled patient who has developed a high level of knowledge and expertise to enable them to manage and control their own conditions. The researchers designed and developed the system using clinical medicine books, doctors, and questioners. The system helps students to deeply understand diabetes and diagnose it by explaining its types and shows the reasoning for each one. An initial study was done to measure the effect and performance of using intelligent tutoring system on the students. Evaluation of the system has shown pretty satisfactory results and positive effects as far as its learning capabilities and usability are concerned.