Empiricism is the use of evidence discovered in scientific experiments. The Scientific Method requires that all hypotheses and theories be tested against direct observations of the natural world. Evidence-based healthcare, used in all major health disciplines in Western medicine, has its roots in empiricism. Treatment approaches and decisions are aided by the evidence obtained in meta-analyses, systematic reviews, and randomized controlled trials.
Valid evidence must be empirical—it cannot be based solely on assumptions, intuition, or revelation.