What Happens When We Die?

Quick Answer

Philosophically speaking, what happens when we die is not one question but several. There is a biological question about the cessation of the body, a metaphysical question about whether the person survives, and an evaluative question about whether death is a harm to the one who dies. On the first question, biology and medicine give the working answer: death is the irreversible cessation of the integrated functioning of the organism, and in modern practice the death of the brain is treated as the death of the person. On the second question, philosophy divides. Epicurus argued that death is nothing to us, because the subject who could experience it is not there to experience it. Materialist and physicalist philosophers hold that the mind depends on the brain and that death therefore ends the person completely. Dualist and religious traditions hold that the soul may continue. On the third question, Thomas Nagel and Shelly Kagan have argued in different ways that death can be a harm — a deprivation — even when it is the absolute end. This page explains these positions. It is a philosophical and educational discussion; it is not medical advice, and it does not describe what any particular person should expect at the end of life.

What the Question Asks

To ask what happens when we die is to assume that there is a "we" that can be tracked through death. That assumption is itself the heart of the debate. A physicalist who identifies the person with the living, functioning body will answer that nothing happens to the person, because the person ceases to exist; a dualist who identifies the person with an immaterial soul will answer that the person continues in another state; a Buddhist will answer in terms of the continuation of causal processes rather than a fixed self. The question therefore folds into the philosophy of mind and the philosophy of personal identity. It also folds into the philosophy of time: if a person is a being extended through time, what it means for that person to die depends on how the future relates to the present. The question is ancient — Plato's Phaedo stages Socrates' last conversation about the soul's fate — and it remains unsettled precisely because it depends on these deeper questions about the nature of persons, minds, and time.

Historical Background

The philosophical history of the question begins with Socrates, who in Plato's Phaedo argues that the soul is immortal and that the philosopher, who has practiced detachment from the body, should welcome death as release into a purer existence. The Phaedo offers several arguments for immortality: the cyclical argument from opposites, the recollection argument from innate knowledge, and the affinity argument from the soul's kinship with the simple and unchanging. Plato's student Aristotle rejected the view that the soul is a separate substance; for Aristotle, the soul is the form of the body, and although the active intellect may be separable, the ordinary functions of the soul perish with the organism. Epicurus, writing around the same period, dismissed the whole picture: the soul is atomic and material, dissolves at death, and — since the dead cannot feel — death is nothing to us. The Stoics agreed that the soul is bodily and mortal, and Augustine, centuries later, defended the Christian view that the soul is created, immaterial, and immortal, and that death is the separation of soul from body that will be reversed at the resurrection. These four positions — Platonic dualism, Aristotelian hylomorphism, Epicurean materialism, and Augustinian Christian dualism — set the terms that contemporary philosophy still argues with.

Key Arguments

Epicurus and the "nothing to us" argument. In his Letter to Menoeceus, Epicurus writes that death is nothing to us, "for while we exist death is not present, and while death is present we do not exist." The argument is that harm requires a subject who experiences it; death is the absence of any subject; therefore death cannot be bad for the one who dies. The argument targets the fear of death, not the fear of dying, and it remains the opening move in most contemporary discussions.

Nagel and the deprivation account. Thomas Nagel, in his essay "Death," argues that Epicurus's argument is too quick. Death can be bad for the person who dies even though there is no subject to experience it, because death deprives the person of goods that life would have contained — friendships, projects, pleasures, the continuation of a life worth living. Nagel's deprivation account treats the badness of death as a relational fact: death is bad when the life it cuts short would have been good on balance, just as betrayal is bad for someone who never learns of it.

Kagan and the nature of persons. Shelly Kagan's Yale course and his book Death approach the question by asking first what a person is. If persons are material beings, then death is the end of the person, and any talk of survival is confused. Kagan examines dualist arguments for the soul and finds them wanting, then develops a physicalist framework in which the person is a complex material thing whose death is genuine annihilation — which makes the question of death's badness urgent rather than trivial.

Dualist and religious alternatives. Platonists, Christians, and many other traditions argue that the person is not identical to the body, so the question "what happens when we die" has an answer that goes beyond the decomposition of the corpse. These views face the hard problem of explaining how an immaterial soul could interact with a material body, and how memory and personality could survive brain damage. Philosophy can lay out these arguments fairly; it cannot, by itself, prove which picture is true.

Contemporary Relevance

The question has left the seminar room and entered hospitals, courts, and policy debates. The modern definition of death — brain death — is itself a philosophical decision about where the person is located: if the person is the bearer of consciousness and agency, then the destruction of the brain that makes consciousness possible is the death of the person, even if the body is kept breathing by machines. End-of-life medicine, organ donation, and the ethics of life support all presuppose an answer to "what happens when we die" in the sense of "when does the person cease to exist." At the same time, grief, mourning practices, and the human need to make sense of loss keep the older question alive: many people find it meaningful to speak of the dead as still present, in memory, in influence, in the continuation of projects and relationships. Contemporary philosophy does not dismiss that need; it asks what, if anything, it commits us to about what death is. None of these reflections is a substitute for the guidance of physicians, counselors, and end-of-life professionals, who should be consulted for matters of care.

Related Topics

• What Is Death? — the philosophical definition of death and its meaning across traditions.
• What Is the Self? — whether the self is the kind of thing that can survive bodily death.
• What Is the Philosophy of Death? — the field that studies death from the perspective of philosophy.
• What Happens to Consciousness When We Die? — the fate of conscious experience at death.
• Is There Life After Death? — arguments for and against survival of death.

Sources

1. Stanford Encyclopedia of Philosophy, Death.
2. Stanford Encyclopedia of Philosophy, Consciousness.
3. Thomas Nagel, Mortal Questions (Cambridge University Press, 1979), especially the essay "Death."
4. Shelly Kagan, Death (Yale University Press, 2012), available from Yale University Press.