Gangrene occurs when body tissue dies from infection or lack of blood flow, producing a dark and decaying appearance. Historically it was greatly feared because it often required amputation and could spread rapidly. Literary works use gangrene as a powerful image of corruption and irreversible decline. Poets may describe societies, relationships, or moral conditions as gangrenous to emphasise the spread of decay that threatens the whole structure, turning a physical disease into a metaphor for deep-seated deterioration.

Gangrene is the death of tissue caused by infection or loss of blood supply. In literature the term powerfully symbolises corruption spreading through a body or society. Poets may describe moral decay, political rot, or social injustice as gangrene infecting the larger organism of civilisation. The imagery emphasises irreversible damage and the danger of neglecting early problems. Its vivid medical association makes it a striking metaphor for destructive decline.