Is the Term Mental Illness Helpful?

by Brenton L. Delp

The phrase mental illness is one of the most familiar expressions in modern psychology and psychiatry. It appears compassionate, medical, and destigmatizing. It tells us that depression, anxiety, psychosis, addiction, trauma, and other forms of suffering are not simply moral failures. It suggests that people deserve care rather than condemnation. In this sense, the phrase has done real social good. It has helped move suffering people out of the category of sin, weakness, possession, degeneracy, or criminality and into the realm of treatment. Yet the very usefulness of the term is also what makes it dangerous. Because it is broad, it is easy to use. Because it is easy to use, it is easy to stop thinking. And once we stop thinking, very different forms of human suffering are forced into one category as though they all meant the same thing.

The problem begins with the word mental. If illness means disease of an organ, then “mental illness” is already ambiguous. The mind is not an organ in the same way the liver, kidney, lung, or pancreas is an organ. If the illness is medical, then it is not strictly the mind that is ill; it is the body, nervous system, endocrine system, immune system, or brain affecting mental life. A tumor can alter personality. Dementia can destroy memory. Thyroid dysfunction can produce depressive symptoms. Epilepsy can disturb consciousness. Substance intoxication or withdrawal can produce hallucinations, paranoia, panic, or confusion. In such cases, the language of illness is not metaphorical. Something biological is wrong, and mental life is affected because human consciousness is embodied. The body suffers, and the mind suffers through the body.

But many conditions called mental illnesses are not illnesses in this same sense. Depression, anxiety, trauma, addiction, obsessive-compulsive symptoms, personality disorders, and many forms of despair do not always involve an identifiable disease process in the way pneumonia, cancer, diabetes, or multiple sclerosis do. They may involve biology, of course. Everything human involves biology. But to say that an experience has biological correlates is not the same as saying it is a disease. Grief has biological correlates. Love has biological correlates. Religious awe, fear, rage, shame, and memory all have biological correlates. The fact that the brain participates in an experience does not by itself prove that the experience is an illness.

This is one reason the DSM is more careful than popular language often is. The DSM-5-TR does not simply say that a mental disorder is any unusual thought or painful emotion. It defines a mental disorder as a clinically significant disturbance in cognition, emotion regulation, or behavior that reflects dysfunction in psychological, biological, or developmental processes, usually involving distress or disability. It also states that an expectable response to a common stressor or loss, such as bereavement, is not by itself a mental disorder, and that socially deviant behavior or conflict with society is not a disorder unless it arises from dysfunction within the individual.¹ This is an important caution. The DSM’s own definition is not saying, “Whatever disturbs society is mental illness.” Nor is it saying, “Whatever causes suffering is mental illness.” It is attempting to distinguish disorder from ordinary suffering, social nonconformity, moral conflict, and cultural difference.

Yet even here, the problem remains. The DSM uses the phrase mental disorder, not because it has solved the philosophical problem of mind, body, illness, and responsibility, but because clinicians need a shared language. Diagnosis helps organize symptoms, guide treatment, communicate across systems, and structure research. It is practical language before it is metaphysical truth. The DSM itself acknowledges that diagnosis is developed for clinical, public health, and research purposes, and that additional information is required for legal judgments involving responsibility, competency, or disability.² That admission matters. A diagnosis can describe a syndrome. It cannot by itself settle the meaning of a life, the presence or absence of responsibility, or the moral weight of an action.

This becomes especially clear when we consider extreme examples of human destructiveness. Figures such as Jeffrey Dahmer or Ted Bundy are often brought into discussions of mental illness because their acts seem so far beyond ordinary moral comprehension. But even here, the phrase can obscure as much as it reveals. If we say “mentally ill,” do we mean psychotic? Do we mean neurologically impaired? Do we mean incapable of moral responsibility? Do we mean disordered in personality? Do we mean evil? Do we mean dangerous? These are not the same claims. A person may be cruel without being psychotic. A person may be disordered without being legally insane. A person may have a diagnosis and still be morally responsible. Conversely, a person may suffer from severe psychosis and commit acts under a profoundly impaired grasp of reality. The phrase mental illness is too blunt to make these distinctions.

This is why the term becomes especially problematic when it absorbs moral, existential, cognitive, developmental, and medical realities into one undifferentiated mass. A person with schizophrenia experiencing hallucinations is not in the same condition as a person grieving a spouse, a person addicted to opioids, a person trapped in obsessive rumination, a person with narcissistic traits, a person with traumatic flashbacks, a person despairing over meaninglessness, and a person committing predatory violence. There may be overlap. There may be shared vulnerability. But these are not identical phenomena. To call them all “mental illness” may be administratively convenient, but it is intellectually imprecise.

The cognitive perspective shows this clearly. Cognitive therapy does not usually begin by assuming the mind is diseased. It begins by examining patterns of interpretation. A depressed person may interpret failure as final, rejection as proof of worthlessness, and the future as closed. An anxious person may overestimate danger and underestimate capacity. A person with obsessive-compulsive symptoms may become trapped in intolerable uncertainty and compulsive attempts at reassurance. These patterns are painful and disabling, but the word illness may not be the most accurate description. They may be rigid forms of meaning-making. They may be habits of attention. They may be learned responses to fear, shame, trauma, or repeated defeat. Calling them illnesses may reduce blame, but it can also reduce agency. The person may come to believe that the problem is simply something they “have,” rather than something in which they participate and which, with help, they may learn to transform.

The existential perspective raises an even deeper concern. Much of what gets called mental illness may involve the collapse of meaning. Human beings suffer not only because neurotransmitters fluctuate or cognitions distort, but because they are finite, vulnerable, self-conscious creatures who must live with death, freedom, guilt, isolation, responsibility, and uncertainty. A person may become depressed because life has lost intelligibility. A young person may become anxious because the future appears impossible. A person may become addicted because ordinary life no longer provides relief, belonging, transcendence, or hope. These forms of suffering are not reducible to disease. They are crises of existence. They may become clinically severe. They may require treatment. But they also ask questions that medicine alone cannot answer: What is worth living for? What do I owe others? What has happened to my hope? What kind of person am I becoming? What do I do when the old sources of meaning no longer hold?

Depth psychology adds another difficulty. Symptoms may not only be malfunctions; they may also be communications. A panic attack, compulsion, depression, dream, fantasy, or addiction may express something split off from conscious life. Jung understood symptoms, at least in part, as signs of psychic imbalance. The unconscious does not merely disrupt consciousness; it compensates for consciousness. A person who has lived too one-sidedly may be interrupted by what was excluded. A person who has adapted too well outwardly may collapse inwardly. A person who has built an identity on control may be overtaken by anxiety, compulsion, or dream images that reveal the limits of control. From this perspective, the symptom is not simply an illness to be removed. It may be a symbolic demand for integration.

This does not mean that all suffering is meaningful in a romantic sense. Severe psychosis, catatonia, melancholic depression, suicidal despair, mania, delirium, and trauma can be devastating. To deny the medical dimension of such suffering would be cruel. Medication can save lives. Hospitalization can protect people. Diagnosis can open access to care. Biological vulnerability is real. Some conditions are so severe that philosophical interpretation by itself is inadequate and irresponsible. The critique of “mental illness” should not become an excuse to abandon medicine. The point is not that psychiatry is useless. The point is that psychiatric language must remain humble about what it explains.

Thomas Szasz famously attacked the concept of mental illness, arguing that many so-called mental illnesses were not diseases in the medical sense but “problems in living.”³ Szasz saw the term as a dangerous metaphor that could blur the line between illness, deviance, and social control. His critique remains valuable because it exposed the hidden assumptions in psychiatric language. But Szasz also went too far. Some psychiatric conditions are not merely conflicts, choices, or social inconveniences. Psychosis, bipolar disorder, severe depression, neurocognitive disorders, and profound trauma-related conditions can involve forms of suffering and impairment that are not adequately described as ordinary problems in living. The better position is not to reject psychiatric language altogether, but to discipline it.

Jerome Wakefield’s concept of “harmful dysfunction” is useful here. Wakefield argued that disorder involves both harm, which is partly a value judgment, and dysfunction, which refers to some failure of a psychological or biological mechanism to perform as expected.⁴ This helps clarify the issue. A condition is not a disorder merely because society dislikes it. Nor is it a disorder merely because it is statistically unusual. Nor is it a disorder merely because it causes suffering. Human life includes suffering that may be normal, meaningful, or proportionate. But when suffering is joined to dysfunction—when a person’s capacity to think, feel, perceive, relate, choose, or act becomes seriously impaired—then clinical language becomes more justified.

Still, even “harmful dysfunction” cannot settle everything. Human beings are not machines with one obvious function. What counts as proper functioning in grief, sexuality, aggression, dependence, ambition, religious experience, or moral guilt is not always self-evident. A person who refuses to adapt to a sick society may be called disordered by that society. A person who feels despair in the face of genuine emptiness may not be malfunctioning; he may be perceiving something others avoid. A teenager who is anxious in a fragmented, competitive, technologically saturated world may not simply have an anxiety disorder; she may be registering the conditions of the age. The more psychological suffering reflects the structure of a culture, the less adequate purely individual diagnosis becomes.

This is why George Engel’s biopsychosocial model remains important. Engel criticized the narrow biomedical model for excluding psychological and social dimensions from medicine and argued for a model that includes biological, psychological, and social realities together.⁵ This is a better frame than the phrase mental illness alone. Human suffering is embodied, but not merely bodily. It is cognitive, but not merely cognitive. It is social, but not merely social. It is existential, but not merely philosophical. It is symbolic, but not merely symbolic. A person is not a brain floating in a skull. A person is a living body, a history, a family system, a set of meanings, a moral agent, a social being, and a consciousness trying to endure reality.

So is the term mental illness helpful? Yes, but only within limits. It is helpful when it protects people from moral contempt. It is helpful when it opens access to treatment. It is helpful when it reminds families, schools, courts, and communities that severe psychological suffering is real and cannot be solved by shame, punishment, or willpower alone. It is helpful when a person needs medication, hospitalization, disability protection, therapy, or crisis intervention. It is helpful as a public-health term.

But it is not helpful when it becomes a total explanation. It is not helpful when it implies that the mind itself is diseased in a simple medical sense. It is not helpful when it turns grief, despair, moral conflict, developmental injury, trauma, addiction, alienation, or spiritual crisis into mere pathology. It is not helpful when it separates symptom from meaning, diagnosis from biography, suffering from culture, or treatment from responsibility. It is not helpful when it makes people passive before their own lives.

A more precise language would distinguish illness, disorder, distress, dysfunction, impairment, adaptation, injury, crisis, and evil. Some conditions are illnesses of the body that affect consciousness. Some are disorders of psychological functioning. Some are wounds of development. Some are crises of meaning. Some are habits of attention and interpretation. Some are consequences of trauma. Some are conflicts between the individual and society. Some are failures of moral formation. Some are mixtures of several of these. The task is not to abolish diagnosis, but to prevent diagnosis from replacing thought.

The phrase mental illness should therefore be used as a doorway, not as a conclusion. It may begin the conversation, but it should not end it. Behind every diagnosis stands a person whose suffering must be understood medically, cognitively, developmentally, socially, existentially, and morally. To say this is not to weaken care. It is to deepen it. The goal is not less seriousness, but greater accuracy. The human being is not merely ill. The human being is embodied, wounded, interpreting, desiring, remembering, fearing, choosing, and seeking meaning. Any language that forgets this will eventually become too small for the reality it tries to name.

Notes

1. American Psychiatric Association, Diagnostic and Statistical Manual of Mental Disorders: DSM-5-TR, 5th ed., text rev. (Washington, DC: American Psychiatric Association Publishing, 2022), definition of mental disorder.
2. American Psychiatric Association, DSM-5-TR, “Use of the Manual” and “Cautionary Statement for Forensic Use of DSM-5.”
3. Thomas Szasz, “The Myth of Mental Illness,” American Psychologist 15, no. 2 (1960): 113–118. See also Brendan D. Kelly’s summary of the controversy fifty years later, noting Szasz’s claim that mental illness was a harmful myth lacking demonstrated biological pathology.
4. Jerome C. Wakefield, “The Concept of Mental Disorder: On the Boundary Between Biological Facts and Social Values,” American Psychologist 47, no. 3 (1992): 373–388; see also Wakefield, “The Concept of Mental Disorder: Diagnostic Implications of the Harmful Dysfunction Analysis,” World Psychiatry 6, no. 3 (2007): 149–156.
5. George L. Engel, “The Need for a New Medical Model: A Challenge for Biomedicine,” Science 196, no. 4286 (1977): 129–136. Engel argued that the biomedical model left out psychological, social, and behavioral dimensions of illness and proposed the biopsychosocial model as an alternative framework.