Body Integrity Dysphoria is now recognised in the ICD-11, but recognition has not settled the question of cause. The answer, for now, is multifactorial: BID may involve the brain’s map of the body, the formation of a powerful internal body image, and a wider culture in which identity is increasingly expressed through bodily transformation. None of these explanations is sufficient alone. Together, they may form a Gestalt: something greater than the sum of its parts.
Body Integrity Dysphoria is now recognised in the ICD-11, but recognition has not settled the question of cause. The answer, for now, is multifactorial: BID may involve the brain’s map of the body, the formation of a powerful internal body image, and a wider culture in which identity is increasingly expressed through bodily transformation. None of these explanations is sufficient alone. Together, they may form a Gestalt: something greater than the sum of its parts.
Body Integrity Dysphoria is now recognised in the ICD-11, the World Health Organization’s diagnostic manual. This gives the condition a formal clinical name. It also creates a problem. Medicine has named BID, but it still does not know exactly what causes it, nor how it should be treated.
BID is defined as a strong and persistent desire to become physically disabled in a significant way. Most often, this means the desire for limb amputation, but it may also involve paralysis, blindness, or other forms of impairment. The desire usually begins early in life and is accompanied by distress, discomfort, or a strong sense that the current body is somehow wrong.
I shall be careful with the word disabled here.
I support the social model of disability, in which impairment refers to a bodily or functional difference, such as the absence of a limb. Disability refers to the restrictions created by the social world around that impairment, such as stairs without a ramp, workplaces that exclude wheelchair users, or institutions designed only for able-bodied people. In this sense, a person with BID may desire impairment rather than disability. They may want the body to change because the present body feels excessive, incorrect, or over-complete. The desired impairment may even be imagined as a way to reduce suffering and improve psychosocial functioning much as the removal of an alien growth from the body would normally be restoring, rather than damaging, the person’s wellbeing.
Of course, the distinction is never so neat in daily life. A person who uses a wheelchair may experience disability because the post office has no ramp. That social exclusion can then intensify the bodily experience of impairment. The two are conceptually different, but practically entangled.
This is one reason BID is so difficult. The person does not wish for suffering, exclusion, or helplessness. They want a body that feels correct.
There are many ways to approach the aetiology of Body Integrity Dysphoria. I will focus on three that sit closest to my own field of expertise: the anthropological, embodied, and cultural dimensions of the condition. Rather than treating BID as a purely medical puzzle, I want to ask how brain, body image, tool use, witnessing, and culture may interact in producing the desire for impairment.
The first approach looks at the brain and at how bodily ownership is represented neurologically. The second looks at mental imagery, body schema, tool use, and pretending behaviours, meaning the ways in which a desired impaired body may be imagined, rehearsed, and temporarily simulated. The third looks at the wider cultural world, where bodily identity has become increasingly unstable, image-based, and open to redesign. My argument is that these theories should not be treated as rivals. As with all human conditions, a single cause is insufficient. BID may emerge from the interaction of several factors, forming a Gestalt: something greater than the sum of its parts.
The First Explanation: The Brain
The neurological explanation is the most obvious starting point.
Some brain-imaging studies suggest that people with BID may show differences in areas involved in body ownership and body representation. These are the systems that allow us to feel that this arm, this leg, this body, belongs to us. They help create the ordinary sense that the body is complete, familiar, and properly ours.
In BID, that sense of bodily ownership appears to be disturbed.
The person knows the limb is there. They know it is physically attached. They are not delusional. They are not claiming that the limb belongs to someone else. BID should also be distinguished from conditions such as factitious disorder, historically associated with Münchausen syndrome, where illness may be produced or exaggerated; Alice in Wonderland syndrome, where perception of size or body proportion may be distorted; or Cotard syndrome, where a person may believe they are dead, missing organs, or do not exist.
For BID, the limb is present, functioning, and recognised as physically attached. The problem is that it does not fit the person’s body image. It feels like an excess part of the body, an addition that should not be there.
This also makes BID different from ordinary dissatisfaction with appearance. It is not like disliking one’s nose or wishing to be taller. Many people with BID do not see the unwanted limb as ugly or defective. The issue is not aesthetic disgust. It is a mismatch between the physical body and the body the person experiences as correct.
This is why neurological evidence is important. It helps move BID away from older and misleading interpretations: fetish, deviance, attention-seeking, lifestyle choice, or moral failure. For a long time, the condition was discussed through the language of paraphilia, and that shadow still affects how many people instinctively react to it. The brain evidence suggests that something is happening at the level of bodily self-representation.
Yet the brain explanation does not close the question.
The old conundrum remains: does brain activity generate the experience, or does experience shape brain activity? In practice, this separation is obsolete. Brain and experience move together. Asking which came first can become like asking whether the chicken or the egg came first.
The brain is shaped by memory, attention, imitation, repetition, emotion, and the body’s daily interaction with the world. If BID has a neurological signature, that signature may be cause, consequence, or both. It may show that the body map has changed, but it does not explain why that map changed in this particular way.
This is where the second explanation becomes important.
The Second Explanation: Image, Body Schema, Tool Use, and Witnessing
The psychological explanation focuses on mental imagery.
Many people with BID describe an early encounter with an amputee, a wheelchair user, or another person with an impaired body. This encounter is often remembered as the moment when something becomes clear. It may trigger a fascination already present in the background, or it may create a new and powerful bodily image.
The child sees an impaired body. Somewhere, something happens. The image enters the imagination and stays there.
Over time, this image may become fixed or reinforced. It is repeated, imagined, rehearsed, and emotionally charged. The actual body begins to feel less correct than the imagined impaired body. The desired body becomes specific: the side of the body, the limb, the level of amputation, the use of crutches or prosthetics, the imagined posture, the future shape of ordinary life.
This specificity is one of the striking features of BID. Many people report that the desired body remains stable for years or decades, even if the intensity rises and falls like a wave. The desire may become stronger during certain periods and quieter during others, but the basic image often remains the same.
That kind of stability is difficult to explain through culture alone. It suggests the formation of a powerful internal body image.
Here the distinction between body image and body schema becomes useful.
I will put it simply. Body image is the conscious picture or sense we have of our body: what we think our body is, how it appears to us, and how we experience it as ours. Body schema is more practical and less conscious. It is the body’s working system for movement, posture, and action. It allows us to walk through a doorway, pick up a cup, use a tool, or move without constantly calculating where every limb is.
Normally, body image and body schema work together. In BID, they may become misaligned. The conscious sense of the correct body may not match the body’s physical form. The actual limb remains present in the body schema, but the body image may treat it as excessive or wrong.
This is where tool use becomes important.
Studies on bodily perception suggest that tools can alter the way we experience the body. When someone uses a hammer, brush, stick, crutch, or wheelchair, the tool can become incorporated into practical bodily awareness. It is not only used from the outside. It can become part of how the body acts and perceives space.
Cautiously applied to BID, the idea becomes intriguing. A person who pretends to be an amputee binds a limb, uses crutches, sits in a wheelchair, or mimics the desired bodily configuration may not only be acting out a fantasy. These practices may alter bodily experience. They may bring body image and body schema closer to the desired impaired body.
This is what pretending means in the BID context. It is the simulation of the desired bodily configuration. A person may immobilise a limb, hide it, use mobility aids, or move through the world as if the amputation or impairment had already occurred. Many describe this as relieving. For a period of time, the body feels closer to what it should be.
The problem is that relief can reinforce the image. The more the simulated body brings comfort, the more convincing the imagined body becomes. The body image is strengthened through positive feedback. The person returns to practice because it reduces distress. Repetition then gives the desired body greater psychological and perceptual force.
Mental images, therefore, shape perception, emotion, memory, and bodily experience. In BID, the image may become so stable that the biological body starts to feel like the incorrect one.
Witnessing and the Over-Empathic Response
Within the second explanation, there is another important element: witnessing.
Many BID narratives include an early encounter with an impaired body. The person sees an amputee, a wheelchair user, or someone with a specific bodily form, and the encounter becomes central to the later story of the condition.
This is where I place what I shall call the over-empathic response.
Most children see impaired bodies without developing BID. They may be curious, frightened, fascinated, or indifferent. The key question is why, for some people, the witnessed body becomes internalised as a possible version of the self.
My proposal is that some individuals may have an unusually intense bodily response to the impaired body. This is not ordinary sympathy. It is not pity. It is closer to over-identification: a powerful empathic or perceptual reaction in which the body of the other is absorbed as a template for one’s own body.
The speculation is intriguing. Perhaps the impaired body, first witnessed at a young age, triggers curiosity. Curiosity sharpens attention. Attention strengthens memory. Memory absorbs the image until it leaves something like a burn mark in the imagination: the mental image of the impaired body, fixed with unusual force.
The image crosses the boundary between other and self. It becomes charged, meaningful, and self-referential. The amputee or wheelchair user is no longer only another person. Their bodily form becomes a possible answer to the question: what should my body be?
This also explains why sight is so important. BID often begins through seeing. The visual encounter provides the image; pretending and tool use then give that image bodily confirmation.
In this model, witnessing is the trigger or catalyst. Mental imagery is the mechanism. Pretending and tool use are reinforcement.
This keeps the over-empathic idea in its proper place. It is not a separate fourth cause. It is part of the social and perceptual formation of the desired body image.
The Third Explanation: Culture, Image, and the Body as Project
The third proposal situates BID inside a culture increasingly dominated by images, self-design, and bodily transformation. The contemporary body is constantly displayed, compared, edited, corrected, filtered, optimised, medicalised, and redesigned. Cosmetic surgery, fitness culture, gender medicine, prosthetics, avatars, filters, and online body communities all belong to this wider world.
The body has become a project.
Culture therefore provides visual material, language, and permissions through which bodily alienation becomes meaningful. Earlier societies also had amputees, war injuries, blindness, paralysis, and deformity. What they did not have was the same image-saturated culture of bodily redesign, medical transformation, digital comparison, and personal authenticity expressed through the body.
In a culture dominated by images, the body is watched, is judged, is compared against other bodies, ideal bodies, modified bodies, filtered bodies, and imagined bodies. A shared and stable sense of what the human body is supposed to be becomes weaker. In its place, we find a marketplace for possible bodies.
This is why the postmodern explanation remains useful, even if it is deliberately provocative.
We are living in postmodernity, or perhaps beyond it, as I have argued elsewhere. In this world, image-based culture may amplify the importance of mental imagery. It may make it easier for a person to internalise a bodily image that has no stable relation to inherited bodily norms. It may also weaken the cultural counterweight that once told individuals that the given body was the body one had to inhabit.
In BID, the desired impaired body may therefore become more than a private image. It may become an identity possibility.
A related mechanism appears in cosmetic surgery and other body-modification practices. Media images do not create every individual desire for surgery, but they shape what people notice, compare, dislike, idealise, and seek to change. BID differs from cosmetic surgery because the person with BID does not seek beauty, enhancement, or the correction of ugliness. Even so, both phenomena show how body image can be shaped by the visual world.
How the Three Explanations Form One Condition
Asking which theory is correct may already narrow the problem too much.
BID probably has a neurological dimension. Brain-imaging studies suggest that bodily ownership and body representation may be altered. BID also has a psychological and embodied dimension. Mental imagery, fascination, repetition, body schema, tool use, and pretending behaviours appear central to many accounts. BID also has a social and cultural dimension. Witnessing, over-identification, visual culture, and changing ideas of bodily identity all seem relevant.
These levels work together.
At the neurological level, BID may involve an altered body map. At the psychological level, it may involve a stable and powerful image of the desired impaired body. At the embodied level, pretending and tool use may reinforce that image and temporarily bring body image and body schema closer together. At the interpersonal level, witnessing an impaired body may trigger an over-empathic or over-identificatory response. At the cultural level, the body appears in a world where identity is increasingly expected to express itself through bodily form.
This is why the word multifactorial is accurate. BID may be a Gestalt condition. The pieces do not sit beside each other like separate items in a list. They combine into a structure.
The brain gives the image force. The image gives the desire shape. Witnessing gives the image an origin. Pretending and tool use give the image bodily confirmation. Culture gives the whole process a wider field of meaning.
This does not solve BID, nor does it tell us what treatment should look like. It explains why single-cause theories remain unsatisfying.
Essay adapted from my book Body Integrity Dysphoria and the Ethical Dilemma of On-Demand Amputation. Redefining Wholeness: Identity, Autonomy, and the Moral Boundaries of the Human Body
More writing at leandroloriga.com