A few disorders have some of the same symptoms as
schizophrenia (schizophrenia spectrum disorders),
Schizotypal personality disorder. A person with schizotypal personality disorder has a difficult
time developing close relationships with other people and may hold beliefs not
shared by other people in his or her same culture. The person may also have
unusual behaviors and learning difficulties.
Schizoid personality disorder. A person with schizoid
personality disorder is aloof from other people and does not show many
Delusional disorder. People with
delusional disorder believe things that could happen but are unlikely to happen. For example, a person with delusional disorder may believe he or she has cancer despite several negative test results. The person has no other psychotic symptoms, except those related to the delusion. But he or she is able to function in daily life.
Schizoaffective disorder. People with schizoaffective disorder
have the same symptoms as people with schizophrenia. But they also have
episodes of depression and times when they feel extremely happy or have lots of
energy (mania). For more information, see the topics Depression and Bipolar
Schizophreniform disorder. People
with schizophreniform disorder have the same symptoms as people with
schizophrenia. But their illness episodes do not last as long (from 1 to 6
months), and they may not have as many problems getting along with other
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