The Hidden Hierarchy of Illness

Medically Unexplained, Socially Unrecognised

Modern medicine presents itself as a neutral arbiter of disease. Yet in conditions such as Functional Neurological Disorder (FND), Myalgic Encephalomyelitis / Chronic Fatigue Syndrome (ME/CFS), and other medically unexplained conditions, what is most visibly at stake is often not treatment, but legitimacy. ¹ Who is recognised as genuinely ill? Who is granted empathy? And who is quietly repositioned as difficult, weak, or morally suspect?

These questions expose an uncomfortable truth, societies operate with a largely unspoken hierarchy of suffering. At the top sit conditions with visible causes such as tumours or infections. Here, suffering is easily coded as misfortune. Empathy flows readily, responsibility is displaced onto an object, and the individual is preserved as fundamentally intact, a good person to whom a bad thing has happened.

Lower down the hierarchy sit disorders without stable, localisable pathology such as fatigue syndromes, functional neurological symptoms or chronic pain. Here, despite often profound disability, suffering becomes morally unstable. When causation cannot be pointed to, it collapses back onto the person. The clinical gaze quietly becomes a moral one.

The same pattern appears far beyond medicine. If a man kills his mother and is found to have a frontal lobe tumour, he is widely regarded as a patient. The situation is tragic, and the perpetrator deserves treatment and pity. If his brain is shaped into the same behavioural outcome by genetics, developmental, or environmental factors and a normal scan, he is more readily a monster. ² In both cases, behaviour emerges from altered regulatory systems. But only one allows causation to be outsourced to a foreign object. The tumour absorbs guilt. The normal scan returns it to the self.

This difference has little to do with neuroscience, and everything to do with how societies preserve their moral categories. Lesions rescue agency. They allow us to say, ‘This was not really him’. Processes do not. They force us to confront that what we call character, will, or motivation are themselves fragile constructions of biology and context. ³

When Fatigue Has No Status

Exactly the same structure governs the legitimacy of fatigue. Fatigue secondary to multiple sclerosis is readily recognised as real. Fatigue of equivalent severity in ME/CFS is contested and quietly downgraded. The lived experience may be indistinguishable. The social meaning is not. One story preserves the model ‘good person plus bad object equals illness’. The other destabilises it, and so suffering is reinterpreted as identity.

As a rehabilitation physician working closely with patients with long-standing ME/CFS and functional disorders, I have repeatedly been struck by a paradox that is difficult to forget. Several patients whom I had followed for years, disabled by profound fatigue, cognitive dysfunction, and loss of function, were later found to have incidental MRI findings that supported a diagnosis of multiple sclerosis. Each time, I expected devastation. Instead, more than one patient told me that the day they were given the diagnosis of MS was ‘the best day of my life’. Not because their suffering had changed, but because, for the first time, it had become legitimate. They were no longer exhausted without cause, disabled without explanation, or ill without status. They had crossed an invisible threshold from a condition that required justification into one that commanded recognition.

A Post Modern Perspective

Postmodern thought is useful here not because it denies biology, but because it exposes the cultural methods through which biology is granted meaning. ⁴ It asks not only what is wrong with bodies, but how certain forms of malfunction are authorised as real while others are quietly moralised. It makes visible that legitimacy is not discovered by instruments; it is distributed by institutions.

Postmodern thought is often misunderstood as a rejection of science or of material reality. In fact, its central concern is not whether bodies are real, but how reality is authorised. Postmodernism examines the social, historical, and institutional processes through which some forms of knowledge become dominant while others are marginalised. In medicine, it draws attention to how suffering is not only investigated but also interpreted, ranked, and legitimised. From this perspective, medically unexplained conditions are not simply technical failures awaiting future biomarkers; they are sites where the power to define what counts as ‘real illness’ becomes visible. A postmodern lens is therefore useful here not because it denies biology, but because it exposes the cultural and moral frameworks through which biology is granted meaning.

When legitimacy is monopolised by lesion-based medicine, patients with fatigue and functional disorders are structurally positioned to fail recognition. Their suffering is real, but its form does not map cleanly onto the objects our systems are designed to certify. The result is not neutral uncertainty, but delegitimisation and suspicion. This is not primarily a failure of compassion. It is a category problem. We are asking a lesion-detection system to certify functional realities.

The Limits of Lesion-Based Medicine

It may be necessary to confront a more unsettling possibility that orthodox medicine, shaped by centuries of anatomical localisation, and evidence hierarchies, may never be fully equipped to apprehend or legitimise conditions organised around instability of function rather than demonstrable damage. This is not a failure of clinicians nor a rejection of biomedical science, but a recognition that Knowledge like instruments, are selective. They illuminate some realities brilliantly and render others indistinct. In this context, rehabilitation medicine represents not a secondary service, but a different medical culture. Its organising commitments to function, participation, adaptation, and lived capacity align more naturally with fatigue-based and functional disorders. Rehabilitation professionals are trained to work productively in uncertainty, to intervene without full mechanistic explanation, and to build clinical legitimacy around trajectories of function rather than lesions. ⁵ This places rehabilitation medicine in a uniquely qualified position not only to treat these patients, but to advocate for them, and to serve as a clinical home for forms of suffering that acute biomedical frameworks continue to struggle to recognise.

Disability and rehabilitation studies have already performed a quiet corrective. It relocated the centre of gravity from diagnosis to function, from cause to participation, from pathology to lived constraint. In doing so, it demonstrated that recognition need not wait for mechanisms. One can acknowledge suffering, protect dignity, and justify support without resolving ontology. This is not anti-scientific. It is anti-monopoly of science over meaning.