Adults living with severe mental illness are nearly five times more likely than the wider population to die from serious physical diseases before the age of 75, according to an analysis of NHS data. The findings, released by the charity Rethink Mental Illness, indicate that this group dies 15 to 20 years earlier than other adults, with preventable physical conditions such as cancer among the leading causes.
The research points to a persistent and severe gap in health outcomes that extends well beyond mental health itself. While the public conversation around severe mental illness often focuses on psychiatric symptoms and crisis care, the data suggest that physical health problems are quietly driving much of the excess mortality. Cancer and other chronic conditions that are treatable or manageable in the general population appear to be claiming the lives of people with severe mental illness at far higher rates and at much younger ages.
According to the analysis, the deaths are largely attributable to conditions that could be prevented, detected earlier, or treated more effectively. That framing places the issue squarely within the broader debate over health inequalities and access to care. People with severe mental illness frequently face barriers to routine screening, follow-up appointments, and coordinated treatment across physical and mental health services. As a result, conditions such as cancer may be diagnosed at later stages, when outcomes are significantly worse.
The charity's findings are based on NHS data and were described as exclusive in the reporting of the analysis. They add to a growing body of evidence that people with serious psychiatric conditions experience a substantially reduced life expectancy, not primarily because of their mental illness, but because of physical diseases that the health system is failing to address in a timely way.
The scale of the disparity is stark. A nearly fivefold increase in the risk of dying before 75 from serious physical disease represents one of the most pronounced health gaps documented in the adult population. The 15- to 20-year reduction in life expectancy is comparable to the toll of major chronic diseases and underscores how deeply physical and mental health are intertwined.
For health policymakers, the data raise difficult questions about how care is organized. Severe mental illness can make it harder for patients to attend appointments, advocate for themselves, or manage complex treatment regimens. At the same time, physical health complaints in this group may be overlooked or attributed to psychiatric symptoms, delaying diagnosis and treatment. The result is a cycle in which preventable conditions progress unchecked.
Rethink Mental Illness has argued that the findings demonstrate the need for better integration of physical and mental health care. That could include more systematic screening for cancer and other chronic diseases among people with severe mental illness, clearer pathways between psychiatric and general medical services, and targeted efforts to reduce the stigma that can affect how symptoms are interpreted by clinicians.
The analysis also highlights the importance of data transparency. By examining NHS records, the charity was able to quantify a gap that has long been suspected but is rarely measured with such precision. The figures provide a benchmark against which future improvements, or further deterioration, can be assessed.
While the research focuses on adults in the United Kingdom, the underlying pattern is not unique to one health system. International studies have repeatedly shown that people with severe mental illness die earlier than the general population, with cardiovascular disease, respiratory illness, and cancer among the leading causes. The new NHS data reinforce that pattern and sharpen the case for treating physical health as an essential part of mental health care.
For patients and families, the implications are immediate. The findings suggest that anyone supporting a person with severe mental illness should be alert to physical symptoms and ensure they receive routine preventive care. For health services, the message is that reducing premature mortality in this group will require action outside the traditional boundaries of psychiatric treatment.
The charity's analysis arrives amid ongoing scrutiny of NHS performance and health inequalities. It offers a concrete measure of how far the system still has to go in delivering equal care to one of its most vulnerable populations. Without targeted intervention, the data indicate, adults with severe mental illness will continue to die years earlier from conditions that other patients survive.
