A phenomenon where patients experience real improvements in their condition after receiving an inactive treatment, solely due to their belief that they are being treated. The effect demonstrates the powerful influence of psychological expectations on physical and mental health outcomes.
From Latin 'placebo' meaning 'I shall please,' originally used in medieval funeral rites as the opening word of a psalm. The medical usage began in the 18th century when physicians used 'placebo' to describe treatments given more to please patients than to cure them, eventually leading to recognition of its therapeutic power.
Placebo effects can be so powerful that they work even when patients know they're taking a placebo - called 'open-label placebos.' Brain scans show that placebo painkillers actually trigger the release of natural opioids, meaning the 'fake' treatment creates very real biochemical changes in the brain!
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