Quackery is the use of primitive methods of medical treatment and healing by those who only pretend to have the necessary knowledge and qualifications to heal. Sick people may put all their hope and money into quack healing, hoping it will alleviate the diseases against which modern medicine is impotent, and those diseases which standard doctors refuse to treat. Such blind faith, usually encouraged by the quack healers, can lead to severe emotional and financial distress if the alternative methods - often viewed as the last resort - fail to produce the desired effects.
The derisive term "quack" has repeatedly been bestowed on those who step out of established order, who are ahead of their times, and whose methods may gain future respect and acceptance. The early advocates of antisepsis, anaesthesia, immunization and other innovations were thus branded. The mesmerism of the 18th century has become today's hypnosis or psychosomatic sleep, and the bone-setter of early days is today's physiotherapist. But other practices, such as homeopathy, acupuncture, naturopathy, and herbology are still regarded with scepticism, perhaps because they provide relatively inexpensive remedies for the patient to apply by himself and thus threaten the expensive - and extensive - monopoly today's doctors have over healthcare.