The book explains the causes of health and disease. Ibn Sina believed that the human body<unk> ot be restored to health unless the causes of both health and disease are determined. Ibn Sina stated that<unk>  (tibb) is the science by which we learn the various states of the human body when in health and when not in health, and the means by which health is likely to be lost, and when lost, is likely to be restored. In other words,<unk>  is the science whereby health is conserved and the art whereby it is restored after being lost.
Avicenna regarded the causes of good health and diseases to be:
The Qanun distinguishes mediastinitis from pleurisy and recognises the contagious nature of phthisis (tuberculosis of the lung) and the spread of disease by water and soil. It gives a scientific diagnosis of ankylostomiasis and attributes the condition to an intestinal worm. The Qanun points out the importance of dietetics, the influence of climate and environment on health, and the surgical use of oral anaesthetics. Ibn Sina advised surgeons to treat cancer in its earliest stages, ensuring the removal of all the diseased tissue. The Qanun 's materia medica considers some 760 drugs, with comments on their application and effectiveness. He recommended the testing of a new drug on animals and humans prior to general use.
The earliest known copy of<unk>  dated 1052 is held in the collection of the Aga Khan and is to be housed in the Aga Khan Museum planned for Toronto, Ontario, Canada.
The Arabic text of the Qanun was translated into Latin as<unk> <unk> e by Gerard of Cremona in the 12th century and into Hebrew in 1279. Henceforth the<unk>  served as the chief guide to medical science in the West and is said to have influenced Leonardo da Vinci. Its encyclopaedic content, its systematic arrangement and philosophical plan soon worked its way into a position of pre-eminence in the medical literature of Europe, displacing the works of Galen and becoming the text book for medical education in the schools of Europe. The text was read in the medical schools at Montpellier and Leuven as late as 1650, and Arnold C. Klebs described it as "one of the most significant intellectual phenomena of all times." In the words of Dr. William Osler, the Qanun has remained "a medical bible for a longer time than any other work".  
The first three books of the Latin<unk>  were printed in 1472, and a complete edition appeared in 1473. The 1491 Hebrew edition is the first appearance of a medical treatise in Hebrew and the only one produced during the 15th century. In the last 30 years of the 15th century it passed through 15 Latin editions.
In recent years, a partial translation into English was made.
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