Death

Overview

Death is an irreversible end of life marked by a cessation of brain function or circulatory or respiratory functions. It's a crucial medical and legal determination in the healthcare system, and roughly 68 million people die worldwide annually. Throughout history, human death has been seen as a central life phase event. Communities have formed distinct rituals, mourning practices, and religious beliefs about the human experience tied to this milestone.

Approximately 3.1 million Americans die annually, with about 98% declared dead based on cardiopulmonary criteria—meaning they're not breathing and have no heartbeat. The other 2% are declared brain-dead, a medical diagnosis based on an extensive series of neurological tests.

Death triggers a series of events in the body that ultimately lead to decomposition. Muscles relax, including the bladder and bowels, so feces and urine are typically expelled soon after death. Within hours, as the body stops producing adenosine triphosphate—a molecule needed to relax muscles—a rigid state called rigor mortis takes hold. This temporary condition fades within about 24 hours. Next, within 24 to 48 hours, the body begins to consume its own tissues through autolysis and produces discoloration, gas, and unpleasant odors.

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