A diagnosis is made via a medical professional’s evaluation.
As in schizophrenia, individuals with schizophreniform disorder have symptoms such as delusions, hallucinations, disorganised thinking and speech, and bizarre and inappropriate motor behaviour (including catatonia) that indicate loss of contact with reality.
Because of this similarity, medical professionals carefully assess how long psychotic symptoms have been present.
If they last longer than a month but resolve within six (6) months after they begin, a schizophreniform disorder is diagnosed.
However, medical professionals must rule out any temporary psychosis that might be the result of a substance use disorder or another medical condition.