Big Pharma conspiracy theories are conspiracy theories which claim that the medical community in general and pharmaceutical companies in particular, especially large corporations, operate for sinister purposes and against the public good, that they conceal effective treatments, or even cause and worsen a wide range of diseases for the purpose of profitability, or for other nefarious reasons. Some theories have included the claim that natural alternative remedies to health problems are being suppressed, the claim that drugs for the treatment of HIV/AIDS are ineffective and harmful, the claim that a cure for all cancers has been discovered but hidden from the public, claims that COVID-19 vaccines are ineffective, and that alternative cures are available for COVID-19. In each case the conspiracy theorists have blamed pharmaceutical companies' search for profits. A range of authors have shown these claims to be false, though some of these authors nevertheless maintain that other criticisms of the pharmaceutical industry are legitimate.
