- 
  
  Discovered the difference between small pox and measles.
- 
  
  Alcmaeon of Croton distinguished veins from arteries.
- 
  
  
- 
  
  The Plague of Justinian affected Egypt, Europe, and West Asia. Killing 40% of the population. 25 to 50 million; 40% of poulation.
- 
  
  Avicenna writes The Book of Healing and The Canon of Medicine.
 The Canon became a standard textbook for medical education in the emerging medical schools of Europe.
- 
  
  Roger Bacon invents spectacles.
- 
  
  
- 
  
  Leonardo de Vinci dissects corpses.
- 
  
  College of Physicians founded now known as Royal College of Physicians of London is a British professional body of doctors of general medicine and its subspecialties. It received the royal charter in 1518
- 
  
  The findings on human anatomy in De Fabrica Corporis Humani was published by Vesalius.
- 
  
  Zacharius Jannssen invents the microscope.
- 
  
  Blood cells are first discovered by Anton van Leeuwenhoek.
- 
  
  
- 
  
  Treatise of the Scurvy becomes published stating that citrus fruits prevent scurvy.
- 
  
  The first successful appendectomy is performed.
- 
  
  Rene Laennec invents the stethoscope.
- 
  
  The first successful transfusion of human blood is performed.
- 
  
  Dr. Horace Wells uses nitrous oxide as an anesthetic
- 
  
  
- 
  
  Karl Landsteiner introduces the system to classify blood into A, B, AB, and O groups
- 
  
  Creates the first band-aid.
- 
  
  Insulin first used to treat diabetes.
- 
  
  First vaccine developed for diphtheria.
- 
  
  First vaccine developed for whopping cough.
- 
  
  First draft of human genome is announced; the finalized version is released three years later.
- 
  
  
- 
  
  Isabelle Dinoire of France was the first person to have partial face transplant while the first full face transplant happened in Spain in 2010.
- 
  
  Scientists discover how to use human skin cells to create embryonic stem cells.
- 
  
  The FDA approves the first human clinical trials in the United States for a wearable artificial kidney designed by Blood Purification Technologies Inc. out of Beverly Hills, California.