In this articles, we intend to set an expert system to contribute to the making of good decisions a solution based on the resolution to separate the base of knowledge part involving the expertise under the form If … Cond … Action. This study is on lumbago or backache, which is not an illness but a symptom. This is about pain in the back, which is acute if it lasts less than a month and chronic beyond three months. This pain is common, almost everyone suffers from i tat one stage of his/her life. The study covers a period going 2015 to 2018 at the hospital of Aenemia at Yolo Machine learning is based on the idea that system scan learn about data, identify trends and take decisions with less human intervention. It automates the creation of analytical models.