Pain is a strange medical phenomenon: dull or sharp, mild or intense, it's difficult to describe and so often tough to treat, too. But we're increasingly understanding how pain affects the brain—and this video explains what we know.

You've probably noticed that some people can ignore pain and focus on what they're doing, while other find a similar experience debilitating. That's all to do with how our nervous system interacts with our brain, and by better understanding it scientists are able to develop new treatments that work better than ever. This video rattle through the science behind that in a rapid but entertaining four minutes. [TED-Ed]