Schizophrenia is a chronic brain disorder that affects how a person thinks, perceives, feels, and functions. It typically first appears in the late teens through the twenties in men and somewhat later in women, and it affects roughly one person in a hundred worldwide. The public picture of the condition is largely wrong: most people with schizophrenia are not violent, the diagnosis does not mean a split personality, and a substantial proportion of those treated early go on to work, study, and live independently. What most shortens life in schizophrenia is not the illness itself but ordinary, treatable physical disease that goes unaddressed.
Symptoms
- Positive symptoms: Hallucinations, most often hearing voices; delusions, which are fixed beliefs held despite clear contrary evidence; and disorganized speech or thinking. These are the symptoms medication treats most effectively.
- Negative symptoms: Reduced motivation, blunted emotional expression, social withdrawal, reduced speech, and diminished capacity for pleasure. These respond poorly to medication and often cause more day-to-day disability than the positive symptoms do.
- Cognitive symptoms: Difficulty with attention, working memory, and executive function. They are frequently present before the first psychotic episode and are a strong predictor of how well someone will function long-term.
- The prodrome: Months to years of gradual social withdrawal, falling performance at school or work, unusual ideas, and sleep disturbance often precede the first episode. Recognizing this period matters, because earlier treatment is associated with better outcomes.
Causes and Risk Factors
Schizophrenia arises from an interaction between genetic susceptibility and environmental factors rather than from any single cause. Heritability is substantial, though most people with the diagnosis have no affected parent, and the genetic contribution is spread across many common variants rather than one gene. Complications during pregnancy or birth, older paternal age, childhood adversity, and growing up in an urban environment each add modest risk. Cannabis use in adolescence, particularly of high-potency products, is associated with a meaningfully increased risk of developing psychosis in those already susceptible.
Diagnosis
There is no blood test or scan that diagnoses schizophrenia. Diagnosis is clinical, made by a psychiatrist on the basis of characteristic symptoms persisting for at least six months with significant functional impairment. The important work early on is excluding other explanations, because several conditions produce psychosis and are treated entirely differently. Substance use, particularly stimulants and cannabis, medication effects, thyroid disease, autoimmune encephalitis, temporal lobe epilepsy, and severe mood disorders including bipolar disorder and psychotic depression all need to be considered. That workup typically includes blood tests and sometimes brain imaging, which is where primary care is usually involved first.
Treatment
Antipsychotic medication is the foundation of treatment and works well for positive symptoms in most people. Commonly used options include risperidone, aripiprazole, and quetiapine, with iloperidone among the further alternatives. Long-acting injectable forms such as paliperidone palmitate are given every few weeks or months and consistently reduce relapse and rehospitalization, because they remove the daily decision to take a tablet. When two adequate trials of different antipsychotics have failed, clozapine is the treatment with clear superior evidence, and it requires regular blood monitoring.
Medication alone is not sufficient treatment. Coordinated specialty care after a first episode, combining medication with therapy, family education, and supported employment or education, improves outcomes more than medication by itself. Cognitive behavioral therapy for psychosis, family intervention, and supported employment all have evidence behind them, and the National Institute of Mental Health describes these programs and how to find them.
Physical Health: Where Most Years Are Lost
People with schizophrenia die on average fifteen to twenty years earlier than the general population, and the great majority of that gap is cardiovascular and other physical illness, not suicide and not the psychiatric illness itself. This is the part an internal medicine practice can change.
Metabolic monitoring is not optional
Most antipsychotics cause weight gain, and several raise blood sugar and cholesterol substantially. Weight, blood pressure, fasting glucose or A1C, and a lipid panel should be checked at baseline and at regular intervals afterward. This monitoring is frequently missed, and when diabetes or high cholesterol develops it should be treated as actively as it would be in anyone else, which is often not what happens.
Smoking, screening, and the rest of medicine
Smoking rates are far higher in this population, and nicotine dependence responds to the same effective treatments here as anywhere else. Routine cancer screening, dental care, and vaccination are all delivered less often to people with serious mental illness, and closing that gap is straightforward once someone is attached to a practice that expects to see them. Our behavioral health care team works alongside psychiatry rather than in place of it.
Why treatment stops, and what helps
Relapse is usually preceded by stopping medication, and medication is usually stopped for understandable reasons: side effects, feeling well, cost, or the practical difficulty of a daily routine during a difficult period. Each of those has a response, from switching agents to a long-acting injection to involving family in the plan. Raising it is far more useful than stopping quietly.
When to Seek Care
Seek assessment promptly for a first episode of hallucinations, delusions, or markedly disorganized thinking, and for the gradual withdrawal, falling function, and unusual ideas that can precede one in a young adult. Earlier treatment is associated with better long-term outcomes, so this is worth acting on rather than watching. Thoughts of self-harm, threats to others, inability to care for oneself, or a sudden change in someone already diagnosed require urgent assessment, and the 988 Suicide and Crisis Lifeline is available at any hour. MedlinePlus has a plain-language overview for families.
If you or a family member has schizophrenia and has not had blood pressure, glucose, and cholesterol checked in the past year, schedule a visit; that is the appointment most likely to add years.