noun
endorphin
A neurotransmitter produced in the brain; often associated with pain relief and feelings of pleasure. Used in medical and everyday contexts.
運動するとエンドルフィンが出るらしい。
They say that exercise releases endorphins.
エンドルフィンは天然の鎮痛剤とも呼ばれる。
Endorphins are sometimes called natural painkillers.
ドーパミン is associated with reward and motivation, while エンドルフィン is more linked to pain relief and euphoria.
Loanword from English 'endorphin', a blend of 'endogenous' and 'morphine'.