Alternative medicine has been described as "any of various systems of healing or treating disease (as chiropractic, homeopathy, or faith healing) not included in the traditional medical curricula taught in the United States and Britain". Alternative medicine practices are often based in belief systems not derived from modern science. Alternative medicines may therefore incorporate spiritual, metaphysical, or religious underpinnings, untested practices, non-Western medical traditions, or newly developed approaches to healing (from Wikipedia).