The inability to feel pain; a condition in which pain signals are blocked or not perceived by the body or brain.
From Greek a- (without, not) + algesis (sense of pain) + -ia (condition). Literally means 'condition of not feeling pain.' The term emphasizes the absence or insensibility to pain.
Analgesia can be natural (like runners' high from endorphins) or induced (with painkillers), but interestingly, people with congenital analgesia can't feel pain at all—they often injure themselves without knowing it because pain is actually a crucial warning system.
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