Medieval Middle Eastern Doctors started a lot of the techniques doctors use today. Muslims created the worlds first hospitals for doctors to treat patients in. Our doctors today still practice in hospitals. Doctors would treat ailments through drugs, diet, and exercise similar to doctors today. Medieval doctors had drugs to dull pain, clean wounds, heal wounds, and put you to sleep like common drugs doctors still use today. An important discovery during this time by Al - Razi was that infectious diseases are caused by bacteria. This helped doctors begin to diagnose and treat deadly diseases.