Aviation medicine, also called flight medicine or aerospace medicine, is a preventive or occupational medicine in which the patients/subjects are pilots, aircrews, or astronauts.[1] The specialty strives to treat or prevent conditions to which aircrews are particularly susceptible, applies medical knowledge to the human factors in aviation and is thus a critical component of aviation safety.[1] A military practitioner of aviation medicine may be called a flight surgeon and a civilian practitioner is an aviation medical examiner.[1] One of the biggest differences between the military and civilian flight doctors is the military flight surgeon's requirement to log flight hours.[2]