Schizophrenia is widely understood as a mental illness, but it reshapes the body in profound ways. People with schizophrenia die an average of 15 to 17 years earlier than the general population, with a mean age at death of roughly 59 years. Heart disease, metabolic problems, hormonal shifts, and chronic inflammation all contribute to that gap, and many of these physical changes begin before a person ever takes medication.
What Happens Inside the Brain
Schizophrenia physically alters brain structure. Even at the first episode of psychosis, brain scans show smaller volumes in areas responsible for memory, emotion, and decision-making. The fluid-filled spaces inside the brain (ventricles) are measurably enlarged, and the outer layer of brain tissue thins across multiple regions. The most pronounced thinning occurs in areas involved in face recognition, language processing, and sensory integration.
These changes aren’t just structural. The brain’s chemical signaling goes awry in two key ways. First, dopamine signaling in deeper brain regions becomes overactive, causing the brain to flag irrelevant sights, sounds, and thoughts as deeply meaningful. This misfiring is what drives hallucinations and delusions. Second, a separate signaling system that normally keeps brain activity coordinated becomes underactive. When this system falters, it creates a cascade: the brain’s inhibitory cells can’t properly regulate excitatory cells, leading to a kind of neural noise that impairs thinking, focus, and the ability to filter out unimportant information. These two disruptions feed into each other, which helps explain why schizophrenia produces such a wide range of symptoms.
Heart Disease and Shortened Life Expectancy
Cardiovascular disease is the leading physical killer in schizophrenia, accounting for 40 to 50 percent of deaths. The standardized mortality rate is about 2.5, meaning people with schizophrenia are roughly two and a half times more likely to die in a given year than the general population. This isn’t just a medication side effect. Research shows overlapping genetics between schizophrenia and cardiovascular risk factors, suggesting the illness itself primes the body for heart problems.
Antipsychotic medications compound the issue. Many of these drugs raise cholesterol, increase blood pressure, and promote weight gain, all of which strain the heart over decades of use. The combination of biological vulnerability and treatment side effects creates a cardiovascular risk profile that’s difficult to manage without active monitoring.
Metabolic Changes and Weight Gain
Between 42 and 60 percent of people with schizophrenia are obese. Weight gain is one of the most visible physical effects of the condition, and it hits fast. The greatest weight increase in people new to antipsychotic treatment happens in the first few months. Gaining more than 5 percent of body weight in the first month is the strongest predictor of continued long-term gain.
But the metabolic problems run deeper than weight. Studies of people experiencing their first psychotic episode, before any medication, already show impaired blood sugar regulation and abnormal cholesterol levels. This means schizophrenia itself disrupts metabolism at a fundamental level. Antipsychotics then accelerate the process. Some medications directly interfere with insulin release from the pancreas, and these changes can happen within days, even before significant weight gain occurs. The result is a sharply elevated risk of type 2 diabetes. Central body fat accumulation drives insulin resistance, which in turn fuels further cardiovascular damage.
Chronic Inflammation
People with schizophrenia carry higher levels of C-reactive protein (CRP), the most widely used blood marker of systemic inflammation. Elevated CRP in schizophrenia is linked to worse cognitive symptoms, higher rates of metabolic syndrome, greater cardiovascular risk, and increased overall mortality. Inflammatory molecules called cytokines are also elevated, and genetic variants in immune-related genes appear more frequently in people with the condition.
This low-grade, body-wide inflammation connects many of the physical effects of schizophrenia. It worsens insulin resistance, damages blood vessels, and may contribute to the brain tissue loss seen on imaging. Inflammation isn’t just a consequence of poor physical health in schizophrenia; it appears to be woven into the biology of the illness itself.
Hormonal Disruption
Many antipsychotics block dopamine in a brain region that controls the hormone prolactin, causing levels to rise dramatically. Under treatment, prolactin can reach up to 10 times normal values. When levels climb above 50 ng/mL or cause noticeable symptoms, medication adjustments are typically needed.
The physical consequences of sustained high prolactin are significant. In women, it can stop menstrual periods, cause breast tenderness or milk production, and reduce fertility. In men, it can lower testosterone, reduce sex drive, and cause breast tissue growth. Over the long term, elevated prolactin weakens bones by reducing estrogen and testosterone, raising the risk of osteoporosis. Levels above 100 ng/mL are concerning even without symptoms because of the cumulative damage to bone density and cardiovascular health.
Movement and Motor Problems
Tardive dyskinesia is a movement disorder that develops in 15 to 30 percent of people with schizophrenia treated with antipsychotics. It causes involuntary, repetitive movements, most often in the face: lip smacking, tongue protrusion, grimacing, and jaw movements. It can also affect the arms, legs, and trunk. The movements are not under voluntary control and can be socially distressing and physically debilitating. Rates have dropped somewhat with newer antipsychotic medications, but the condition remains common and can be irreversible even after stopping the drug that caused it.
Altered Pain Perception
Schizophrenia creates a paradox in how the body processes pain. People with the condition tend to have unusually high tolerance for acute, sharp pain, which is partly why serious medical conditions like heart attacks and appendicitis sometimes go unrecognized in this population. At the same time, they often have a lower threshold for chronic, ongoing pain. The likely explanation involves dopamine: excess dopamine in certain brain pathways simultaneously activates the body’s pain-suppressing system for sudden injuries while also amplifying the brain’s attention to persistent discomfort. This mismatch means that people with schizophrenia may not report acute medical emergencies but can be significantly burdened by chronic pain conditions.
Sleep and Circadian Rhythm Disruption
Sleep problems in schizophrenia go beyond simple insomnia. The internal architecture of sleep changes: people spend less time in both deep sleep and REM sleep, and these changes are present even in unmedicated individuals at the onset of psychosis. Deep sleep is when the brain consolidates memories and repairs tissue. REM sleep supports emotional regulation and learning. Losing both contributes to the cognitive difficulties and emotional flatness that characterize the illness.
Half of people with schizophrenia also show severe disruption of their circadian rhythm, the internal 24-hour clock that governs sleep, hormone release, and body temperature. Some have dramatically delayed sleep cycles, not falling asleep until well after 1:00 a.m. and not waking until late morning. Others lose the 24-hour rhythm entirely, with their sleep and melatonin cycles drifting later each day as though their body can’t lock onto the day-night cycle at all. These shifts in melatonin timing confirm that the problem isn’t just behavioral. The body’s core biological clock is out of sync with the outside world, which compounds metabolic and cardiovascular strain.
How These Effects Connect
The physical effects of schizophrenia don’t exist in isolation. Chronic inflammation worsens metabolic syndrome, which raises cardiovascular risk. Poor sleep disrupts blood sugar regulation and amplifies inflammation. Hormonal changes from medication weaken bones while weight gain stresses joints. Altered pain perception means serious conditions go untreated longer. Each physical effect feeds into others, creating a cycle that accounts for much of the 15 to 17 year life expectancy gap. Some of these changes are driven by the illness itself, some by medications that are nonetheless essential for managing psychotic symptoms, and some by the difficulty of accessing consistent physical healthcare when living with a severe mental illness.