Schizophrenia
Definition
Schizophrenia
is a mental disorder. It difficult for a person to tell the difference between real and unreal experiences, to think logically, to have normal emotional responses to others, and to behave normally in social situations.
Causes
Schizophrenia
is a complex and puzzling illness. Even the experts in the field are not exactly sure what causes it. Some doctors
think that the brain may not be able to process information correctly.
Genetic factors appear to play a
role, as people who have family members with schizophrenia may be more likely to get the disease
themselves. Some researchers believe that events in a person's environment may trigger schizophrenia. For example, problems during intrauterine
development (infection) and birth may increase the risk for developing schizophrenia later in life.
Psychological and social factors may also play some role in its development. However, the level of social and familial support appears to influence the course of illness
and may be protective against relapse.
There are 5 recognized types of schizophrenia: catatonic, paranoid, disorganized, undifferentiated, and residual. Features of schizophrenia
include its typical onset before the age of 45, continuous presence of symptoms for 6 months or more, and deterioration from a
prior level of social and occupational functioning.
People with schizophrenia
may show a variety of symptoms. Usually the illness develops slowly over months or even years. At first, the symptoms may not be noticed. For example, people may feel tense, may have trouble sleeping, or have trouble concentrating. They become isolated and withdrawn, and they do not make or keep friends. As the illness
progresses, psychotic
symptoms develop:
- Delusions - false beliefs or thoughts with no basis in reality
- Hallucinations
- hearing, seeing, or feeling things that are not there
- Disordered thinking - thoughts "jump" between completely unrelated topics (the person
may talk nonsense)
- Catatonic behavior - bizarre motor behavior marked by a
decrease in reactivity to the environment, or hyperactivity that is unrelated to stimulus
- Flat affect - an appearance or mood that shows no emotion
No single characteristic is present in all types of schizophrenia. The risk factors include a
family history of schizophrenia. Schizophrenia is thought to affect about 1% of the population worldwide.
Schizophrenia
appears to occur in equal rates among men and women, but women have a later onset. For this reason
, males tend to account for more than half of patients in services with high proportions of young adults
. Although the onset of schizophrenia is typically in young adulthood, cases of the disorder with a
late onset (over 45 years) are known.
Childhood-onset schizophrenia begins after the age of 5 and, in most cases, after relatively normal development. Childhood schizophrenia
is rare and can be difficult to differentiate from other pervasive developmental disorders of childhood, such as autism
.
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