Schizophrenia is a chronic and complex psychotic disorder that alters the perception of reality, behavior, emotions, and daily functioning. It does not mean having a split personality, but rather an alteration in essential mental processes such as perception, thinking, and interpretation of the environment.
It is a heterogeneous disorder, meaning that not everyone experiences the same symptoms or the same clinical course.
Main symptoms of schizophrenia
Positive symptoms
Positive symptoms are manifestations that appear and should not normally be present:
- Delusions: firmly held false beliefs.
- Hallucinations: perceptions without a real external stimulus, especially auditory ones.
- Disorganized thinking: difficulty maintaining logical speech.
- Disorganized behavior: unusual or unpredictable behaviors.
Negative symptoms
Negative symptoms involve the loss or reduction of psychological functions:
- Blunted affect.
- Avolition or lack of motivation.
- Anhedonia or difficulty experiencing pleasure.
- Social isolation.
- Poverty of speech.
Cognitive symptoms
Cognitive symptoms affect daily functioning and often go more unnoticed:
- Difficulties with attention and concentration.
- Problems with working memory.
- Impairment of executive functions.
- Difficulties with planning and decision-making.
Causes of schizophrenia
Schizophrenia does not have a single cause. It is currently understood as a disorder with a multifactorial origin involving genetic, neurobiological, and environmental factors.
Genetic factors
There is a substantial genetic predisposition. There is no single “schizophrenia gene,” but rather multiple genetic variants that increase the risk of developing it.
Neurobiological factors
Research has identified alterations in several brain systems:
- Dopamine dysfunction.
- Alterations in glutamate.
- Changes in brain connectivity.
- Differences in frontal and temporal areas.
Environmental factors
Key environmental risk factors include:
- Childhood trauma.
- Perinatal complications.
- Cannabis use.
- Urbanicity.
- Social exclusion and experiences of discrimination.
Interaction between genetics and the environment
Genetic vulnerability may increase sensitivity to certain environmental factors. Therefore, schizophrenia is best understood as the result of an interaction between biology and the environment.
Diagnosis of schizophrenia
Schizophrenia diagnosis is clinical. It is based on an interview, mental status examination, developmental history, and exclusion of other medical or substance-related causes.
When diagnosing schizophrenia, clinicians assess:
- The presence of psychotic symptoms.
- The duration of symptoms.
- Functional impact.
- The clinical course.
- Exclusion of other causes that better explain the clinical presentation.
Differential diagnosis
It is important to distinguish schizophrenia from other disorders such as:
- Bipolar disorder with psychotic features.
- Major depressive disorder with psychotic features.
- Schizoaffective disorder.
- Delusional disorder.
- Substance-induced psychosis.
Treatment of schizophrenia
Schizophrenia treatment should be comprehensive and combine pharmacological treatment, psychological interventions, and psychosocial rehabilitation.
Pharmacological treatment
Antipsychotics are the cornerstone of treatment, particularly for controlling positive symptoms and reducing the risk of relapse.
- Shared decision-making between the professional and the patient.
- Metabolic and cardiovascular monitoring.
- Monitoring for adverse effects.
- Monitoring treatment adherence.
Clozapine for treatment-resistant schizophrenia
Clozapine is the treatment of choice for treatment-resistant schizophrenia, that is, when there is no adequate response after two appropriate trials with other antipsychotics.
Its use requires hematologic monitoring and close monitoring for possible adverse effects.
Psychological treatment
Cognitive behavioral therapy can help reduce distress associated with psychotic symptoms, improve coping, and support treatment adherence.
Family intervention
Family intervention improves communication, reduces caregiver burden, and may lower the risk of relapse.
Psychosocial rehabilitation
Psychosocial rehabilitation aims to improve independence, functioning, and community integration.
- Activities of daily living.
- Supported employment.
- Cognitive remediation.
- Community support.
Early detection of schizophrenia
Early detection and early intervention are essential. The shorter the duration of untreated psychosis, the better the clinical and functional outcomes tend to be.
Common comorbidities
Substance use
Cannabis use, alcohol, or other substances may worsen the prognosis, increase relapses, and make adherence more difficult.
Depression and anxiety
Depression and anxiety are common in people with schizophrenia and should be specifically assessed.
Cardiometabolic risk
There is an increased risk of obesity, diabetes, metabolic syndrome, and cardiovascular disease, so physical health should be part of treatment.
Social impact of schizophrenia
Schizophrenia affects employment, social life, independence, and quality of life. In addition, stigma remains one of the main barriers to recovery and social inclusion.
Conclusion
Schizophrenia is a serious, complex, and heterogeneous mental disorder with genetic, neurobiological, and environmental causes. Its impact extends far beyond psychotic symptoms and affects cognition, social life, physical health, and community participation.
The most effective treatment is comprehensive and should include antipsychotics, psychological interventions, family support, and psychosocial rehabilitation.
Sharing accurate information about schizophrenia helps combat stigma, improve social understanding, and promote recovery-oriented care.
