Abstract This research work is aimed at designing and developing a computer program that will diagnose and prescribe treatment for hypertension. The research work is concerned mainly on all the varieties of hypertension, most especially the ones that are common in the tropical region and in our present society. Various documents and data were collected, studied and examined from different medical experts for the analysis and design of this particular project. At the end of the study, the expert system design was able to provide solutions to the entire problems identified with the old system during our investigations. Some useful recommendations were also offered.