Pseudoscience can be difficult to spot. defines it only as "a system of theories, assumptions, and methods erroneously regarded as scientific".

Most practitioners of pseudoscience consider themselves scientists and many will point out that many theories that were once laughed at are considered science now. While this is true, it is also true that many, many more theories that were once considered bogus turned out to be bogus.

When pseudoscience comes up here, it typically means science that lacks evidence, or where the evidence is suspect; cherry picked (uses a small amount of evidence while ignoring a much larger body of evidence) or based on conspiracy theories without evidence. It may also refer to scientific studies which were not reproducible (repeating the study yielded a different result than the original study.)

For additional information please see the article What is Pseudoscience from Michael Shermer for Scientific American and/or any of the videos below.