This article is from the Dissociation FAQ, by Discord (email@example.com) with numerous contributions by others.
[or: Some things "the average person" might mistake multiplicity for.]
Schizophrenia: It's not. Although some of the symptoms may look the same,
both to outsiders and the multiple. For a more detailed discussion on this,
see Section 2 of the FAQ.
Manic/Depressive, Bipolar, or Cyclic Disorders: Commonly referred to as
mood swings. Multiplicity may involve what looks like mood swings if the
alters are not in similar states of mind, and one or more alters may
themselves have mood swings, but it _is_ a seperate disorder.
Other forms of dissociation: These are so close to multiplicity that
there is a large grey area between them. However, there are people who
are dissociative who do not in any way consider themselves multiple.