Dr. Ruwan M Jayatunge, M.D. PhD
Immanuel Kant's
exploration of mental disorders is extensively articulated in his later work,
Anthropology from a Pragmatic Point of View (1798). Unlike the predominant
medical or biological perspectives of his era, Kant adopted a pragmatic
approach, emphasizing the impact of mental illness on an individual's cognitive
and moral agency rather than merely its physiological origins.
His philosophy
underscores the importance of self-understanding and resilience in the face of
psychological challenges. For Kant, a sound mind is characterized by the
harmonious functioning of the three faculties—cognition, feeling, and
desire—under the guidance of reason. Disruption in this balance, where one
faculty becomes dysfunctional or unruly, is what he identifies as the root of
mental illness.
Kant's perspective
on mental illness is a philosophical rather than solely a medical issue,
emphasizing the mind's failure to adhere to its own logical and judgmental
norms. He offers profound insights into the essence of mental disorders,
suggesting that individuals bear some responsibility for their mental
well-being, even as he recognizes that certain conditions may be hereditary or
beyond cure.
Kant identifies
the "only universal characteristic of madness" as the substitution of
shared, rational reasoning with an individual's private logic. He categorizes
mental pathologies through a tripartite framework encompassing cognition,
feeling, and desire, distinguishing between weaknesses (deficiencies) and
illnesses (active derangements). In his view, the philosopher, as an expert in
reason, is best equipped to assess the nature of madness, which he sees
fundamentally as a breakdown of rational thought.
Kant’s theory of
mental disorder is a sophisticated philosophical framework defining mental
illness as a breakdown of the conditions for objective experience (Frierson,
2009). Kant argued that mental disorder
is the transition from "common sense" to a "private sense." For Kant,
"common sense" is a normative
tool for testing the truth of our perceptions and judgments against the world.
Kant defined a healthy mind not by the absence of biological disease, but by
its normative functioning—specifically, its ability to align with the universal
rules of logic and a shared social reality.
Kant explicitly
stated that madness can be hereditary, referring to "germs of
madness" that develop alongside physical reproduction. He believed certain
physical states, such as issues with the digestive system or a naturally
"melancholy" temperament, could make an individual susceptible to
mental derangement. Kant argued that nature might provide the
"predisposition" for illness, social life, and personal habits, which
often act as the catalysts. He stated that societal pressure could break the
natural balance of the mind’s faculties. Kant emphasized that even a sound
intellect can fall into illness because human reason is fragile and depends on
constant social communication to remain healthy.
Kant indicated a
profound connection between mental illness and the historical evolution of
society (Falcato, 2025). This indicates that Immanuel Kant did not view mental
illness merely as a biological malfunction. Kant's assertion that humans
possess an inherent inclination toward social interaction, or sociability,
alongside a simultaneous tendency to seek isolation and act in self-interest,
creates a psychological conflict.
As society
progresses, it generates artificial needs that can lead to mental strain. Kant
discussed issues such as hypochondria and mood disorders, arguing that culture
plays a role in shaping and moralizing human behaviour. He suggested that human
nature inherently resists societal constraints, which in turn exerts pressure
on the mind. Kant posited that as society progresses towards greater
civilization and intelligence, individuals become more susceptible to mental
anxieties, a condition he referred to as hypochondria, as well as various
cognitive disorders.
Van den Berg
(2025) highlights that Kant's theory of mechanical explanation remains relevant
and aligns with contemporary mechanistic paradigms. It provides a robust philosophical framework
for the current biological turn in psychiatry and neuroscience. Kant strongly
believed that the mind must be studied through its physical manifestation.
Mental health professionals today assert that mental disorders stem from
dysfunctions within brain circuits. This is a direct application of the Kantian
mechanical explanation.
Kant rejected the
binary choice of viewing madness as either purely a spiritual/moral failing or
purely a biological disease (Polianskii, 2023). However, Kant insisted that the
symptom itself is a disorder of judgment and reason. Kant adopted a moderate
stance: Madness is a medical problem in its origin (requiring a physician for
the body), but it is a philosophical problem in its manifestation (requiring a
rational approach for the mind).
Kant’s
"tripartite psychology" identifies specific failures of the mind that
mirror modern psychotic symptoms. For Kant, a healthy mind is one that
successfully synthesizes sensory data into a coherent experience of reality
(Annett, 2023). Therefore, "mental dysfunction" is not just behaving
oddly, but a structural failure of cognition—the mind's inability to perform
the necessary "synthesis" to construct a stable, shared reality. Kant
argued that true mental illness (dysfunction) occurs when the mind steps
outside the "bounds of sense"—producing thoughts that have no
possible connection to objective experience.
Kant’s
classification of mental illness extends beyond individual health into the
realms of public order and legal accountability (Ferrara, 2022). Kant used
mental illness to define the boundaries of legal agency. A person suffering
from a "malady of the head" is classified as "incapable”,
meaning they lose the legal standing to represent themselves in court or enter
into contracts. Kant argued that because a mentally ill person is governed by a
"private sense" rather than universal reason, their actions are not
"free" in the moral sense. He emphasized that they cannot be punished
for crimes in the same way as a rational citizen, as they lack the capacity to
recognize the law they have broken.
Kant's work from
1798 serves as a pivotal link between the traditional, often supernatural
interpretations of mental illness and the emerging framework of modern medical
psychiatry. Kant should be seen as a forerunner of the trends in modern
psychiatry (Tényi, 2019). Kant was truly
a visionary for his era. During his lifetime, mental illness was frequently
seen as a result of demonic possession or a moral shortcoming. In such a
rudimentary understanding of mental health, Kant's progressive views on the
subject were remarkably advanced, reflecting a deeper insight into the
complexities of the human mind.
References
Annett, N. (2023).
The concept of mental dysfunction: A Kantian critique [Doctoral thesis,
University of East Anglia]. UEA Digital Repository.
https://ueaeprints.uea.ac.uk/95747/1/Final%20copy%20-%202023AnnettNBPhD.pdf
Falcato, A.
(2025). Kant’s early diagnosis: The maladies of the head as a cultural
phenomenon. Philosophy Today, 69(1), 131–147. doi.org.
Ferrara, I.
(2022). The political dimension of pathology: Kantian mental illnesses between
fragility, freedom, and imputation. Estudos Kantianos, 10(1), 119–138. doi.org.
Frierson, P.
(2009). Kant on mental disorder: Part 1. An overview. History of Psychiatry,
20(3), 267–289. doi.org.
Polianskii, D. V.
(2023). Kant's concept of madness, psychiatry and anti-psychiatry. SHS Web of
Conferences, 161, 07007. doi.org.
Tényi T. (2019). [Immanuel Kant's concept of mental disorders].
Psychiatr Hung. 2019;34(3):325-326. Hungarian. PMID: 31570664.
Van den Berg, H.
(2025). Kant’s essentialism and mechanism and their relevance for present-day
philosophy of psychiatry. European Journal for Philosophy of Science, 15(1),
Article 7. doi.org.