Alternative medicine describes practices used in place of conventional medical treatments. Complementary medicine describes alternative medicine used in conjunction with conventional medicine. The term complementary and alternative medicine (CAM) is an umbrella term for both branches. Alternative medicine includes practices that incorporate spiritual, metaphysical, or religious underpinnings; non-European medical traditions or newly developed approaches to healing.
Proponents of evidence-based medicine regard the distinction between conventional and alternative medicines as false, preferring "good medicine" with provable efficacy and "bad medicine" without. "Bad medicine" is any treatment where the efficacy and safety of which has not been verified through peer-reviewed, double blindplacebo controlled studies, regarded as the "gold standard" for determining the efficacy of a compound. It is thus possible for a method to change categories in either direction, based on increased knowledge of its effectiveness or lack thereof. Richard Dawkins, Professor of the Public Understanding of Science at Oxford, argues that alternative medicine should be defined as that set of practices that cannot be tested, refuse to be tested or consistently fail tests. He also states that "There is no alternative medicine. There is only medicine that works and medicine that doesn't work."