Define Existentialism: What It Means and Why It Matters in Bioethics

Existentialism is the philosophy that existence precedes essence, meaning humans first exist without predetermined purpose and must then create meaning through their choices and actions. This principle, traced to Søren Kierkegaard’s reaction against Hegelian idealism in the 19th century, places individual freedom, choice, and responsibility at the center of human experience. Rather than accepting that human nature or essence is fixed, existentialists argue we define ourselves through lived experience and the decisions we make in the face of an often indifferent universe.

For bioethicists, healthcare professionals, and policy makers, existentialist thought offers a critical lens for understanding patient autonomy, end-of-life decision-making, and the lived experience of illness. When a patient refuses life-extending treatment or chooses an unconventional care path, they exercise the existential freedom that Kierkegaard, Nietzsche, and Sartre explored in their work. These aren’t merely abstract philosophical questions. They surface daily in clinical ethics consultations, informed consent discussions, and debates over medical futility.

The philosophy encompasses multiple perspectives on what it means to be human, each examining how individuals confront anxiety, authenticity, and mortality. As demonstrated by academic gatherings like the International Conference on Existentialism, Philosophy and Anxiety scheduled for December 26-27, 2026, in Charleroi, Belgium, contemporary scholars continue wrestling with how existentialist frameworks apply to modern ethical dilemmas. This article defines existentialism’s core principles, explains how existentialist thinking operates in practice, identifies major schools within the tradition, and examines concrete applications to bioethical decision-making. Understanding this philosophy equips practitioners to better respect patient agency while navigating the profound uncertainties inherent in healthcare.

What Existentialism Means: Core Definition and Philosophical Foundation

At its core, existentialism rests on a revolutionary claim: existence precedes essence. This means you aren’t born with a fixed nature, predetermined purpose, or essential blueprint for what you must become. Instead, you exist first, thrown into the world without instructions, and only then do you create meaning, purpose, and identity through the choices you make and the actions you take. Where traditional philosophy often started with abstract definitions of human nature and worked downward to individuals, existentialism flips that order entirely.

The roots of this philosophy trace back to the Danish thinker Søren Kierkegaard in the mid-19th century. Kierkegaard was reacting against the dominant Hegelian idealism of his time, which treated individuals as mere instances of universal Spirit working itself out through history. He rejected that grand system-building, insisting instead that truth is subjective and that each person confronts existence as a singular, irreplaceable self. That focus on the individual’s lived experience, not abstract categories, became the foundation for what later thinkers would call existentialism. Though Kierkegaard himself wrote from a Christian perspective, the philosophical framework he established was grounded in Kierkegaard’s insistence that human beings must actively engage with their own existence rather than passively accept inherited definitions.

Existentialism is best understood as a multi-faceted view of individual Being, encompassing many varying perspectives rather than a single unified doctrine. What unites these perspectives is a shared emphasis on several core themes: individual freedom, the necessity of choice, personal responsibility, and the search for meaning in a universe that offers no ready-made answers. You’re free to choose, but that freedom comes with weight, you’re responsible for what you become and the values you create. The philosophy doesn’t provide a rule book; it insists you write your own.

Existence precedes essence

Humans exist first without predetermined purpose, then create their own meaning and identity through choices and actions.

Being

The fundamental reality of individual existence, emphasizing the lived experience of being human rather than abstract definitions of human nature.

Authenticity

Living in alignment with one’s own values and choices rather than conforming to external expectations or societal roles. It requires honest self-examination and acceptance of responsibility for one’s life.

Freedom

The unavoidable capacity to choose, which existentialists see as both liberating and burdensome since it places full responsibility on the individual.

Responsibility

The obligation to accept ownership of one’s choices and their consequences, stemming from the recognition that no external authority dictates what you must do or become.

Angst

The anxiety or dread that arises when confronting the radical freedom and uncertainty of existence, often experienced when recognizing that life has no inherent meaning.

These concepts form the philosophical machinery for understanding what existentialism actually means in practice. When bioethicists, healthcare professionals, or anyone grappling with questions about autonomy, purpose, or moral choice turns to existentialist thought, they’re drawing on this framework: the idea that we create who we are through the decisions we make, and that this creative responsibility can’t be outsourced to biology, tradition, or divine decree.

How Existentialist Thought Works: The Mechanism of Meaning-Making

Existentialist thought operates through a distinctive philosophical mechanism: individuals must first recognize their radical freedom, then accept the weight of responsibility that comes with it, and finally make authentic choices while confronting the anxiety inherent in this process. This framework addresses fundamental questions about human existence by positioning meaning-making as an active, ongoing task rather than a discovery of pre-existing purpose.

The process begins with the recognition that humans are “thrown” into existence without a predetermined essence or fixed nature. Unlike objects crafted for a specific function, a knife designed to cut, for instance, human beings exist first and only later define themselves through their choices and actions. This initial confrontation with freedom can be disorienting. Where religious or essentialist frameworks provide ready-made answers about human purpose, existentialism insists that no cosmic blueprint dictates who you must become or what your life should mean.

Once this freedom is recognized, responsibility follows inevitably. Because no external authority, whether divine, social, or biological, determines your choices, you alone bear accountability for the life you construct. This is not merely responsibility for individual decisions but for the entire project of selfhood. Every choice, from career paths to ethical stances, contributes to who you are becoming. The existentialist process demands that individuals own these choices fully, without deflecting blame onto circumstances, upbringing, or fate.

This radical freedom and responsibility generate what existentialists call anxiety, angst, or dread, a particular kind of psychological distress distinct from fear of specific threats. Anxiety arises from the vertiginous awareness that your choices matter absolutely, yet no guarantee exists that any particular choice is “right.” There’s no script to follow, no essence to fulfill. This confrontation with groundlessness is central to how existentialist thought works: meaning emerges precisely through the act of choosing authentically despite this anxiety, not by eliminating it.

Authentic decision-making, then, becomes the mechanism through which purpose is constructed. Authenticity means choosing in full awareness of your freedom and responsibility, without self-deception or retreat into predetermined roles. Through repeated authentic choices, actions aligned with your recognition of existence’s contingency, you create the meaning of your life. The existentialist framework thus transforms the absence of inherent meaning from a nihilistic dead-end into the very condition that makes genuine, self-authored purpose possible.

Schools and Perspectives Within Existentialism

Kierkegaard’s Religious Existentialism

Søren Kierkegaard approached existentialism through the lens of Christian faith, establishing a framework fundamentally different from later secular variants. For Kierkegaard, subjective truth, what an individual passionately believes and lives by, holds greater significance than objective, detached knowledge. He argued that authentic existence requires personal commitment rather than rational certainty, particularly in matters of religious faith.

Central to Kierkegaard’s thought is the “leap of faith,” a concept recognizing that genuine religious belief cannot be justified through logical argument or empirical evidence alone. Instead, individuals must make a conscious, anxiety-laden choice to embrace faith despite rational uncertainty. This decision exemplifies the existentialist emphasis on individual responsibility and the impossibility of outsourcing life’s most consequential choices to abstract systems or authorities.

Kierkegaard’s religious existentialism positions the individual’s relationship with God as deeply personal and non-transferable. Unlike systematic theology that seeks universal truths, he focused on how each person confronts the divine through their own lived experience, choices, and subjective inwardness. This approach laid the groundwork for existentialism’s broader insistence that existence precedes essence, that humans define themselves through authentic engagement with life’s fundamental questions rather than conforming to predetermined categories or collective beliefs.

Nietzsche’s Atheistic Existentialism

Nietzsche’s approach to existentialism emerged from his radical proclamation that “God is dead”, not a literal theological claim but a diagnosis of Western civilization’s loss of absolute moral foundations. Without divine authority, Nietzsche argued, traditional values collapse, leaving humans in a void where inherited meaning no longer holds. Rather than despair, he saw this as liberation: individuals must become creators of their own values rather than passive recipients of external moral codes.

Central to Nietzsche’s thought is the concept of the will to power, the fundamental drive to assert one’s existence and create meaning through self-overcoming. Unlike passive acceptance of predetermined essence, Nietzsche envisioned the Übermensch, the person who embraces freedom to construct values aligned with life-affirmation rather than life-denial. This means rejecting the “herd mentality” of conventional morality and accepting full responsibility for determining what matters.

For bioethics, Nietzsche’s framework challenges professionals to examine whether medical ethics relies on unquestioned inherited values or genuinely serves human flourishing. His emphasis on self-created values raises difficult questions about who defines “good” outcomes in healthcare, patients asserting authentic choices or institutional norms claiming universal authority.

Sartre’s Radical Freedom and Responsibility

Jean-Paul Sartre developed existentialism’s most uncompromising formulation: humans are “condemned to be free.” This paradoxical phrase captures a central tension, we possess radical freedom whether we want it or not. For Sartre, no God exists to prescribe human nature or purpose. We arrive in the world without instructions, essence, or predetermined role. Every choice we make defines what we are, and we bear full responsibility for those choices.

This framework strips away comforting excuses. We cannot blame genetics, upbringing, or social structures for our actions. Sartre argued that claiming “I had no choice” is an act of bad faith, a self-deception that denies our fundamental freedom. Even refusing to choose is itself a choice with consequences we must own.

In bioethics, Sartrean freedom surfaces in debates over genetic engineering ethics where parents face choices about their children’s biological traits without divine or natural law to guide them. Sartre’s insistence that we create meaning through action, not discovery, challenges healthcare professionals and patients alike. When a physician presents treatment options, the patient confronts authentic choice, not what they should do, but what they will do. The weight of that freedom, according to Sartre, cannot be delegated or escaped.

Applications of Existentialism in Bioethics and Healthcare

Patient Autonomy and Authentic Medical Decision-Making

Existentialist philosophy fundamentally reshapes patient autonomy by grounding medical decision-making in the patient’s radical freedom to choose rather than in predetermined values or external authority. Where traditional bioethics often frames informed consent as a procedural safeguard, existentialism in French philosophy positions it as an expression of authentic selfhood, the patient actively creating meaning through medical choices.

This approach recognizes that medical decisions carry existential weight because they determine how individuals live with illness, suffering, and mortality. A patient choosing between aggressive chemotherapy and palliative care isn’t merely selecting treatment options; they’re exercising their freedom to define what matters in their remaining time. Existentialist frameworks resist paternalistic nudges that subtly steer patients toward “optimal” outcomes, instead demanding that clinicians present choices without imposing predetermined essences about what constitutes a good life or dignified death.

The contrast with nudges in bioethics reveals this tension clearly. While behavioral interventions may improve statistical outcomes, existentialism insists that authentic choice, even choices clinicians consider suboptimal, honors the patient’s responsibility to construct their own meaning. This connects to broader conversations about absurdism in bioethics and appears increasingly in bioethics topic modeling as scholars examine how philosophical frameworks influence clinical practice.

Meaning-Making in Terminal Illness and Palliative Care

When a patient learns that curative treatment has failed, the existentialist question shifts from “How do I survive?” to “How do I live fully in the time remaining?” This reframing reflects the core existentialist premise: meaning is not inherent in the diagnosis but created through how one responds to it.

Consider a 68-year-old woman with metastatic pancreatic cancer who declines aggressive chemotherapy after weighing her priorities. An existentialist framework recognizes this choice as an exercise in authentic freedom, she accepts responsibility for defining what constitutes a meaningful final chapter rather than defaulting to medical recommendations. Her decision to prioritize lucidity and time with grandchildren over marginally extended survival demonstrates the existentialist principle that individuals construct value through conscious choice, even when confronting mortality.

Palliative care teams increasingly incorporate this philosophical approach. Instead of framing end-of-life planning as resignation, clinicians trained in existentialist thinking help patients explore: What relationships need attention? What unfinished projects matter most? What legacy do I want to leave? These conversations acknowledge suffering while refusing to let diagnosis alone determine meaning.

For families, existentialist perspectives reframe anticipatory grief. Rather than viewing the remaining time as merely “waiting to die,” they can recognize it as an opportunity for intentional connection and closure. The philosophy doesn’t eliminate the anguish of terminal illness but offers a coherent way to navigate it, by asserting that even in dying, humans retain the freedom to choose how they meet the inevitable.

Genetic Engineering and the Question of Human Essence

Existentialism’s central claim that existence precedes essence directly challenges genetic engineering’s implicit assumption that human traits can be predetermined before birth. When scientists design genetic modifications or parents select embryos with desired characteristics, they attempt to define essence before existence, a reversal of the existentialist framework. A child engineered for intelligence or athletic ability begins life with an externally imposed purpose rather than the freedom to create meaning through lived experience. This raises profound bioethical questions: Does genetic enhancement undermine authentic choice by pre-programming values and goals? Can individuals modified before consciousness exercise genuine responsibility for their nature? Existentialist analysis suggests that human enhancement technologies risk treating people as objects to be crafted rather than free subjects who define themselves through action and decision.

Current Discourse: Existentialism in 2026 Bioethical Debates

Existentialist philosophy is experiencing renewed scholarly attention within bioethics, driven by ethical challenges that resist purely utilitarian or principle-based analysis. The International Conference on Existentialism, Philosophy and Anxiety, scheduled for December 26-27, 2026, in Charleroi, Belgium, reflects sustained academic engagement with how existentialist frameworks address questions of meaning, freedom, and responsibility in clinical contexts. This intellectual activity signals that healthcare ethicists increasingly recognize the limitations of approaches that overlook the subjective, lived experience of patients confronting medical decisions.

Artificial intelligence in healthcare exemplifies where existentialist thought offers analytical value. As diagnostic algorithms and treatment protocols become more automated, the question of human agency intensifies: can a patient make an authentic choice when AI systems determine clinical options? Existentialist emphasis on individual freedom and responsibility challenges bioethicists to ensure that technological efficiency doesn’t eliminate the space for patients to construct personal meaning from medical information and treatment pathways.

Pandemic response ethics similarly benefits from existentialist analysis. Public health measures restricting individual freedom, lockdowns, vaccine mandates, resource rationing, create tension between collective welfare and personal autonomy. Existentialist frameworks help ethicists navigate these conflicts by foregrounding the lived reality of individuals whose freedom is constrained and examining whether such constraints allow for authentic moral agency rather than mere compliance.

Human enhancement debates invoke the core existentialist principle that existence precedes essence. If genetic modification or cognitive augmentation allows humans to predetermine traits and capacities, does this undermine the existentialist view that individuals create meaning through free choice rather than fulfilling a predetermined nature? These discussions keep existentialist concepts central to contemporary bioethical discourse.

Common Questions About Existentialism

Healthcare professionals and bioethicists often encounter existentialist concepts without a clear understanding of their philosophical roots. These frequently asked questions address core aspects of existentialism and its relationship to ethical practice.

Understanding existentialism as a multi-faceted view comprising many varying perspectives helps clarify why different healthcare contexts draw on different aspects of the philosophy. A palliative care team might emphasize meaning-making in the face of mortality, while a genetic counselor working with prospective parents might focus on the responsibility that accompanies reproductive freedom. The philosophy’s flexibility allows it to address diverse ethical challenges while maintaining its core commitment to individual agency and authentic choice.

Understanding what existentialism means, grasping its insistence that we create meaning through our choices rather than discovering it ready-made, equips healthcare professionals and bioethicists with a vital conceptual framework. This philosophical perspective helps navigate the messy, human dimensions of medical practice that resist neat procedural solutions: the patient who must decide whether to pursue aggressive treatment, the family grappling with withdrawal of life support, the clinician confronting the limits of technological intervention.

Existentialism’s emphasis on individual freedom and responsibility speaks directly to contemporary bioethical challenges. When we face questions about genetic modification, artificial intelligence in clinical decision-making, or the allocation of scarce resources during public health crises, existentialist thought reminds us that technical capability does not resolve the fundamental question of what choices we ought to make. These dilemmas demand engagement with meaning, authenticity, and the weight of our actions on human existence.

For policy makers and healthcare leaders, existentialism offers a counterbalance to purely utilitarian or procedural approaches. It insists that behind every bioethical question stands an individual confronting their freedom, their mortality, their search for significance. As bioethics continues to grapple with emerging technologies and shifting social values, the dialogue between existentialist philosophy and medical practice will remain essential. The upcoming International Conference on Existentialism, Philosophy and Anxiety in December 2026 signals sustained scholarly interest in these questions, a recognition that how we define ourselves, our choices, and our responsibilities remains perpetually urgent.