This is the first systematic study of Islamic Medicine by a practising Hakim to be published in the English language and is, with minor revisions, the 5th edition of the book, which was originally published in 1986. The discipline of Islamic Medicine is based on the four-element paradigm which offers a completely consistent cosmology, physics, physiology, psychology, and diagnostic and therapeutic science. This book introduces the reader to Tibb as a holistic paradigm of health. It explains the history and philosophy of Islamic Medicine, as well as its psychological and physiological concepts. The book discusses Tibb’s theory of causes, diagnostic methods and offerings for preventative healthcare.