Do not describe an individual as having a mental illness unless it is clearly pertinent to a story and the diagnosis is properly sourced. Mental illness is a general term. Specific conditions are disorders and should be used whenever possible. Avoid terms such as the mentally ill. Instead: people with mental illnesses.
Do not use derogatory terms, such as insane, crazy/crazed, nuts, or deranged, unless they are part of a quotation that is essential to the story. Avoid using mental health terms to describe unrelated issues. Don’t say that an awards show, for example, was schizophrenic.
(Source: AP Stylebook)