A 1998 extensive review of studies assessing its useage in 13 countries, concluded that about 30% of cancer patients use some form of complementary and alternative medicine or healing alternative. Alternative healing & medicines use, varies from country to country. Jurisdictions where alternative medical practices are sufficiently widespread may license and regulate them. Edzard Ernst has said that in Austria and Germany CAM is mainly in the hands of physicians, while some estimates suggest that at least half of American alternative healing practitioners are physicians. In Germany herbs are tightly regulated: half are prescribed by doctors and covered by health insurance based on their Commission E legislation. Globally governments seem to introducing new anti-natural health regulations. New Zealand’s natural health industry is now about to be regulated by the Australian TGA, which has an ominous history of heavy handiness.

Alternative healing medicine is frequently grouped with complementary medicine or integrative medicine, which, in general, refers to the same interventions when used in conjunction with mainstream techniques, under the umbrella term complementary and alternative medicine, or CAM. Some researchers in alternative medicine object to this categorization, preferring to emphasize differences of approach, but nevertheless use the term CAM, which has become standard. Critics maintain that the terms “complementary” and “alternative medicine” are deceptive euphemisms meant to give an impression of medical authority.

Alternative healing medicine methods are diverse in their foundations and methodologies. Methods may incorporate or base themselves on traditional medicine, folk knowledge, spiritual beliefs, or newly conceived approaches to healing. “Although heterogeneous, the major CAM systems have many common characteristics, including a focus on individualizing treatments, treating the whole person, promoting self-care and self-healing, and recognizing the spiritual nature of each individual. In addition, many CAM systems have characteristics commonly found in mainstream healthcare, such as a focus on good nutrition and preventive practices. Unlike mainstream medicine, CAM often lacks or has only limited experimental and clinical study; however, scientific investigation of CAM is beginning to address this knowledge gap. Thus, boundaries between CAM and mainstream medicine, as well as among different CAM systems, are often blurred and are constantly changing.”

Claims about the efficacy of alternative healing medicine tend to lack evidence, and may have even been shown to repeatedly fail during testing. Some researchers state that the evidence-based approach to defining CAM is problematic because some CAM is tested, and research suggests that many mainstream medical techniques lack solid evidence. Though it has to be said that most alternative healing mediciine testing often lacks the required funding to allow extensive study.