As man from the fast day, hungry and thirsty, felt the of something to feed his mouth, being exposed rain and heat of the Sun, ran for shelter, and on being tried and sleepy, desperately felt the need of some save sheltering cover; likewise on getting ill or feeling any Physical discomfort or disease, he started searching for some medicine, herb or remedy. Following the natural rules of survival and God gifted instinct, he made use of all available trees, their branches, leaves, flowers and herbs which resulted sometimes in complete cure, sometimes on resulted into death. Patients failing to gat relief were left at the mercy of circumstances, considering 'death' top be due to some unseen, hidden and divine power.
Medicines/herbs yielding desired relief or results were remembered for future reference. Thus. This natural way of healing was transferred from person to person and place to place. Parsons acting as physicians or guide were respected and were even given the status of 'a God'. As time passed, search for new herbs was intensified and numerous groups at different places were formed. Accordingly, different branches dealing in particular 'system' of treatment come into existence in China (Chinese Medicine), Egypt (Egyptian Medicine), Iran (Iranian Medicine), Italy (Roman Medicine) and India (Ayurveda). One such system medicine was also formed in Greece (Unan). Great and renowned physicians did further research work in this filed as a result of that, a permanent branch of Tibb (system of medicine), widely known as the UNANI SYSTEM OF MEDICINE, came into existence, Hippocrates (Buqrat, 460-377BC), a Greek physician who is also known as the Father of Medicine, further developed this branch of knowledge, For treating the patients, he specially built a compound where patients declared 'uncurable' used to be under his treatment. Besides, people from distant places also to come t him to learn this art ( Unani system of treatment). This way the system peogressed. Eminent personalities like Aristotle (Arastu), Galen (Jalinus, 131-210 AD), Ibn Batar (Ibn Baitar) made an epoch in this domain and their successors were Zakarya Razes ( 850-925 AD) and Avicenna (980-1037 AD). Since these physicians had done all the work and rendered their services purely on humanitarian ground for the ailing humanity, they secured all their knowledge and experience in books for their successors.