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Further evidence. Arch Gen Psychiatry , 53 , 25 — Schizophr Bull , 25 , — J Affect Disorders , 61 , —6. Arch Gen Psychiatry , 35 , — The May invasion of The Netherlands.
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One likely cause of this chemical imbalance is the person's genetic predisposition to the illness. Complications during pregnancy or birth that cause structural damage to the brain may also be involved.
Family relationships No evidence has been found to support the suggestion that family relationships cause the illness. However, some people with schizophrenia are sensitive to any family tension, which for them may be associated with recurrent episodes.
Stress It is well recognised that stressful incidents often precede the onset of schizophrenia. These may act as precipitating events in vulnerable people. People with schizophrenia often become anxious, irritable and unable to concentrate before any acute symptoms are evident. Triggers are things that can cause schizophrenia to develop in people who are at risk.
The main psychological triggers of schizophrenia are stressful life events, such as:. These kinds of experiences, although stressful, do not cause schizophrenia. However, they can trigger its development in someone already vulnerable to it. Drugs do not directly cause schizophrenia, but studies have shown drug misuse increases the risk of developing schizophrenia or a similar illness.
Certain drugs, particularly cannabis , cocaine, LSD or amphetamines, may trigger symptoms of schizophrenia in people who are susceptible. Using amphetamines or cocaine can lead to psychosis, and can cause a relapse in people recovering from an earlier episode. Research has shown that teenagers and young adults who use cannabis regularly are more likely to develop schizophrenia in later adulthood.
Page last reviewed: 11 November Next review due: 11 November Causes - Schizophrenia. You may be prone to schizophrenia.
A stressful or emotional life event might trigger a psychotic episode. But it's not known why some people develop symptoms and others don't. It's more likely that combinations of genes make people more vulnerable. But having these genes doesn't mean you will develop schizophrenia. Evidence that the disorder is partly inherited comes from studies of twins. Identical twins share the same genes. If one identical twin develops schizophrenia, the other has a 1 in 2 chance.
Even if they're not raised together. This is higher than in the general population, where the chance is about 1 in It suggests genes aren't the only factor influencing the development of schizophrenia.
These changes aren't seen in everyone with schizophrenia. They can occur in people who don't have a mental illness. But they suggest schizophrenia may partly be a disorder of the brain.
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