Diseases could be diagnosed by studying their ''nidana'' (etiology), ''poorvarupa'' (premonitory symptoms), ''linga'' (sign and symptoms), ''upashaya'' (exploratory therapy) and ''samprapti'' (pathogenesis).[6] | Diseases could be diagnosed by studying their ''nidana'' (etiology), ''poorvarupa'' (premonitory symptoms), ''linga'' (sign and symptoms), ''upashaya'' (exploratory therapy) and ''samprapti'' (pathogenesis).[6] |