the.com/pain
the body's smoke alarm, screaming at full volume long after the toast is fine
means An unpleasant physical or emotional sensation that signals harm, injury, or distress.
from From Old French 'peine' (suffering, punishment), itself from Latin 'poena' meaning penalty or punishment — the same root behind 'penalty' and 'subpoena.' The Latin 'poena' was borrowed from Greek 'poine,' meaning blood-money or retribution. So the oldest sense isn't sensation at all but punishment, which lingers in phrases like 'on pain of death' — pain as the price you pay.
no receptorsthe brain itself feels no pain directly
phantom limbsamputees feel agony in limbs that don't exist
redheadsgenetics make them need more anesthesia
social hurtrejection lights up the same brain regions
useful cursepeople born painless rarely survive childhood