Although there are narrations of the actual medicinal practices and uses of the Prophet Muhammad himself, due to a various factors there were not any scholars of highest calibre to deduce rules of medicine that could apply to the countless illnesses, from them.
i.e. in Fiqh (Laws of Worship) The scholars took hundreds of Quranic and hadeeth principles and applied them to thousands of methods and cases (masâ’il)
As a result hadîth pertaining to Medicine existed but few valuable commentaries were created causing the science to be lost.
