WPA poster, 1936–38<unk> , often synonymous with health fraud, is the promotion of fraudulent or ignorant medical practices. A quack is a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, qualification or credentials they do not possess; a charlatan or snake oil salesman". The term quack is a clipped form of the archaic term , from a "hawker of salve". In the Middle Ages the term quack meant "shouting". The quacksalvers sold their wares on the market shouting in a loud voice. Common elements of general<unk>  include questionable diagnoses using questionable diagnostic tests, as well as untested or refuted treatments, especially for serious diseases such as cancer.<unk>  is often described as "health fraud" with the salient characteristic of aggressive promotion.
Quackery
Nitpicking
Cheesewiring
Vieworks
Indoor tanning
Stretcher bearer
Hangnail
Caustic pencil