Pseudohistory is produced by the application of the research techniques of the historical method (primary sources and evidence) characteristic of legitimate history; yet, in itself, the work of pseudohistory is intellectually inconsistent with the historical record and with the common-sense understanding held in the collective memory of society. In practice, a pseudohistory presents a big lie—sensational claims—about historical fact that would require the revision (re-writing) of the historical record. The term pseudohistory is applied to works of historical revision that are based upon or derived from a theory or upon a re-interpretation or both; moreover, the related term cryptohistory applied to a pseudohistory based upon or derived from the superstitions inherent to occultism.
The term pseudohistory was coined in the early 19th century; a usage older than the term and earlier than . Similarly, in an 1815 attestation, it is used to refer to Certamen Homeri et Hesiodi, a fictional contest between two historical poets. The pejorative sense of the term, labelling a flawed or disingenuous work of historiography, is found in another 1815 attestation. Pseudohistory is akin to pseudoscience in that both forms of falsification are achieved using the methodology that purports to, but does not, adhere to the established standards of research for the given field of intellectual enquiry to which the pseudoscience claims to be a part, and which offers little or no supporting evidence for its plausibility.
Historian of science Douglas Allchin contends that when history in science discovery is presented in a simplified way, with drama exaggerated and scientists romanticized, this creates wrong stereotypes about how science works, and in fact constitutes pseudohistory, despite being based on real facts.
Writers Michael Shermer and Alex Grobman see pseudohistory as "the rewriting of the past for present personal or political purposes".
Robert Todd Carroll has developed a list of criteria to identify pseudo-historic works. He states that: "Pseudohistory is purported history which: