Complementary and<unk>  are often grouped together, in part because of the adoption of the phrase "complementary and<unk>  medicine" by the United States Congress. Complementary<unk>  are used in conjunction with proven mainstream<unk> . They tend to be pleasant for the patient, not involve substances with any pharmacological effects, inexpensive, and intended to treat side effects rather than to kill cancer cells. Medical massage and self-hypnosis to treat pain are examples of complementary<unk> . About half the practitioners who dispense complementary<unk>  are physicians, although they tend to be generalists rather than oncologists. As many as 60% of American physicians have referred their patients to a complementary practitioner for some purpose. While conventional physicians should always be kept aware of any complementary<unk>  used by a patient, many physicians in the United Kingdom are at least tolerant of their use, and some might recommend them.<unk><unk> , by contrast, are used in place of mainstream<unk> . The most popular<unk>  cancer therapies include restrictive diets, mind-body interventions, bioelectromagnetics, nutritional supplements, and herbs. The popularity and prevalence of different<unk>  varies widely by region. Cancer Research UK warns that<unk><unk>  may interact with conventional<unk>  may increase the side effects of medication, and can give people false hope.
Alternative cancer treatments
Experimental cancer treatment
Longevity medicine 
Tobacco harm reduction
Cancer immunoprevention
Cancer rehabilitation
Toxics use reduction
Suicide prevention