In Ayurveda, There are five processes of diagnosis of disease which tell conversion or the process of moving of a normal physiology to a disease causing pathology called Nidan Panchak. It is the tool to diagnose a particular disease. The processes of diagnosis of a disease start from the establishment of appropriate cause (Nidan) followed by primordial signs and symptoms of the disease (Poorvaroopa). One can even diagnose the disease by signs and symptoms which indicate the definitive abnormalities (Roop).
Hetu (Nidan): Cause
Poorvaroop: Primordial signs and symptoms
Roop: Signs and symptoms
Upshaya: Favorable factors
Samprapti : Pathogenesis