This research, entitled (The Reasons for Doctrinal Transformations), studies the reasons for the transition from following one doctrine to following another doctrine, as this became a phenomenon, and spread among scholars after the establishment of doctrinal schools since the end of the second century AH. The scholars were brought up on a doctrine, then they turned from what they were raised on, and moved to another doctrine. There are objective reasons for this phenomenon, which we studied, and we limited the most important of them to seven, and we dealt with each one of them through a topic: The first topic studies the scientific and methodological influences. The second topic studies the transformation due to obtaining a position in the judiciary or the fatwa. The third topic studies the transformation due to obtaining a position in the Imamate or teaching. The fourth topic studies grumbling and rivalry between students and elders, and between followers of a single doctrine. The fifth topic studies the transformation due to spatial change. The sixth topic studies the transformation as a result of the Doctrinal call. The seventh topic studies the effect of dreaming vision on transformations.