Loneliness, according to the research literature, is a subjective, internal, distressing feeling arising from a perceived gap between the social connections a person has and the social connections they want.
This is the academic definition, stated with some consistency across the major reports on the epidemic’s scale and the reviews of intervention evidence. It is a careful definition.
It is careful because it is honest about what loneliness actually is: an internal experience, perceived rather than measured, subjective rather than objective, varying between people in ways that make standardised assessment difficult and population-level conclusions provisional.
The same literature, when addressing a different audience for a different purpose, describes loneliness as a chronic disease risk factor equivalent in health impact to smoking, obesity, and physical inactivity. It describes social isolation as a clinical condition producing measurable health consequences amenable to evidence-based intervention. It frames the loneliness epidemic as a public health crisis requiring a health system response, resourced and evaluated using the frameworks the health system has developed for chronic disease management.
These are not compatible descriptions of the same thing. A subjective, internal, distressing feeling whose standardised definition is still being debated is not the same kind of object as a chronic disease risk factor with measurable health consequences amenable to clinical intervention. One is an experience. The other is a pathology. The distinction between them determines what kind of response is appropriate, who should provide it, how it should be funded, and what would constitute evidence that the response has worked.
The literature uses both descriptions. It uses them for different audiences. The academic definition appears when the researchers are characterising the phenomenon for each other—acknowledging its complexity, its subjectivity, the difficulty of measuring it consistently, the ongoing debate about what it includes and excludes. The clinical definition appears when the researchers are characterising the phenomenon for funders—the government health departments, the national medical research councils, the commissioning bodies that have budget lines for chronic disease and no budget lines for unmet social needs.
The definition moves because the audience moves. The audience moves because the funding does.
The movement is not unique to loneliness research. It is a feature of any domain where the phenomenon being studied exists at the boundary between the social and the medical, and where the medical framing unlocks resources that the social framing does not. Mental health research has navigated this boundary for decades, and the tensions it has produced—between the experiential account of distress and the diagnostic account of disorder, between the social determinants of mental health and the clinical management of its consequences—are visible in the loneliness literature as well, because loneliness research has imported the mental health sector’s funding strategies along with its measurement instruments.
The consequence of the import is the consequence van Deurzen identified in a different context: the framework renders judgement easy. The chronic disease framework provides a category. The category is fundable. The category is also, in the specific case of loneliness, applied to something that the category’s own definitional standards do not clearly support. A chronic disease has a definition, a mechanism, a recognised diagnostic criterion, and a treatment with measurable efficacy. The academic definition of loneliness acknowledges that standardised definitions are still being debated. The clinical framing is applied to something whose boundaries have not been settled.
The application does specific work. It moves the lonely person from the social world, where their situation would require a structural response—the rebuilt community centre, the walkable neighbourhood, the slow space, the conditions for genuine connection—into the healthcare system, where their situation requires a clinical response—the assessment, the referral, the intervention, the outcome measure. The healthcare system has the infrastructure to receive this movement. It has the staff, the protocols, the measurement instruments, the budget lines. It does not have the infrastructure to address what the academic definition of loneliness describes as its cause: the structural conditions that produce the perceived gap between available and desired social connection.
The patient trap is the outcome of this movement. The person who entered the healthcare system as a person with an unmet social need exits it, if they exit it, as a person who has been assessed, referred, and managed. The management may have reduced their score on the loneliness scale. The score reduction is the outcome the measurement instrument captures and the report records. Whether the structural conditions that produced the unmet social need have changed is outside the scope of the clinical intervention and outside the scope of the outcome measure. The healthcare system was not resourced to address the structural conditions. It was resourced to manage the clinical consequence.
The managed person returns to the lonelygenic environment that produced their situation. The delivery app continues to replace the errand. The suburb continues to be built around the car. The slow space continues not to exist within walking distance. The weak tie continues to have no occasion to form. The score on the loneliness scale may be lower than it was at the point of the clinical assessment. The conditions that produced the score have not been addressed.
The chronic disease framework is useful to the healthcare system because it positions the lonely person as a patient, and patients are the healthcare system’s operational unit. Patients can be counted. Their contact with the system can be measured. Their clinical outcomes can be evaluated. Their cost to the system can be calculated. The reduction in their cost to the system, produced by the intervention, can be presented as the return on the funding investment. The healthcare system is not indifferent to the lonely person. It has found a way to process them that is consistent with its own structure and accountable to its own metrics.
What the healthcare system cannot do is tell the lonely person to go and live somewhere with a local pub that has not been converted into apartments, or to work somewhere that provides ungoverned time for the walk between meetings, or to inhabit a neighbourhood whose design produces the incidental encounters from which genuine connection sometimes grows. These are not clinical recommendations. They are structural observations. The clinical framework does not make structural recommendations. It makes clinical ones.
The definitional flexibility—the moving of the definition between the subjective internal experience and the chronic disease risk factor, depending on whether the researcher is explaining the phenomenon or applying for funding—produces a specific kind of conceptual confusion in the literature that is worth naming precisely. The confusion is this: the intervention is designed to treat something the definition has not settled. The treatment is evaluated against outcomes that the definition’s instability makes it impossible to specify clearly. The outcome measure measures something—a score on a validated scale, a reported reduction in feelings of isolation—that may or may not correspond to the thing the intervention was supposed to address, because what the intervention was supposed to address has two definitions that point in different directions.
The academic definition points toward the structural conditions that produce the perceived gap between available and desired connection. The intervention designed to address the academic definition would change the structural conditions—the built environment, the economic arrangements, the availability of slow spaces, the design of the working day, the architecture of the neighbourhood. The clinical definition points toward the individual’s experience of distress, which can be managed through therapeutic intervention, social prescribing, and connection to community resources. The intervention designed to address the clinical definition does not change the structural conditions. It changes the individual’s relationship to their experience of the conditions.
These are different interventions. They produce different kinds of change. The research literature has developed an outcome measure—the loneliness scale score—that measures something that both interventions can move. The scale score moving does not distinguish between the two kinds of change. It records a number. The number is what the report reports. The report does not specify which kind of change produced the number.
Treating a social nutrient deficiency with a medical diagnosis is the formulation that captures the misdirection most clearly. The social nutrient—the genuine connection, the slow space, the incidental encounter, the weak tie that leads somewhere, the trusted other whose physical presence produces the neurobiological regulation—is absent from the person’s life because the environment that would have produced it has been removed. The absence is producing symptoms: the distress, the health consequences, the cost to the healthcare system that the funding application quantifies as the justification for the grant.
The medical diagnosis addresses the symptoms. It positions the person in relation to a healthcare system that can manage the symptoms with varying degrees of effectiveness. It does not address the absence of the social nutrient, because the absence of the social nutrient is not a medical problem. It is an environmental one. The healthcare system does not have budget lines for environmental problems. It has budget lines for chronic disease.
The person is diagnosed. The treatment is prescribed. The score is measured. The report is produced. The next funding application is submitted.
The social nutrient remains absent.
The environment that would have produced it remains unchanged.
The definition that would have required addressing the environment moves back to subjective, internal, distressing feeling, because the funding has been secured.
The definition that secured the funding was chronic disease risk factor.
The chronic disease was not defined with the stability required for a disease category.
The treatment was never designed for it.
The person remains in the lonelygenic environment.
The score has moved.
The Vorpel Foundation