The brain’s pain circuit

Why do some people have a higher pain tolerance than others? Why are you able to tolerate pain better at some times than others?

First, there may be a pain circuit:

One multinational group of researchers explored the interconnected network of brain regions that may be responsible for your experiencing pain. The scientists asked 116 volunteers to rate the intensity of pain they experienced when a patch of their skin was heated to 120 degrees Fahrenheit.  This is a temperature that …