anguish

Latin angustia — narrowness, a tight place, constriction — comes from angustus, narrow, from angere, to choke or squeeze. The Proto-Indo-European root *angh- meant to press together, to constrict. The same root gave Greek angkhos (strangling), German Angst, and English anger — all words for constrictive, pressing sensations.

The Romans used angustia both literally (a narrow pass, a geographic bottleneck) and figuratively (a difficult, constrained situation; financial difficulty). Angustia meant the tight place you couldn't get through easily — a siege, a debt, a political entrapment. The physical narrowness and the psychological constriction were described with the same word.

Old French angoisse took the Latin word and focused it on the emotional experience: the feeling of being psychologically squeezed. English borrowed angoisse as anguish in the 13th century, focusing it further on intense mental or physical pain. The geographical metaphor disappeared; the constriction feeling remained.

The connection between physical pain and emotional pain that anguish embodies is neurologically real. Neuroscientist Naomi Eisenberger's 2003 fMRI studies showed that the experience of social exclusion activates the same neural regions as physical pain — the anterior cingulate cortex and the anterior insula. Anguish is not a metaphor for pain; it is pain. The tight passage is real.