The loss of social connection, for example, turns out to trigger the same system as physical pain—explaining why the death of a family member, a breakup, or even just a social snub can cause such distress. In one simple experiment, it was discovered that over-the-counter painkillers reduced social pain. Given the power of the pain system in driving our behavior, its connection to our social life underscores the importance of social relationships to our species’ success.
