First, learn about it! For a great overview of how pain works, watch this 5 minute video:
Here is another quick video called "The Drug Cabinet in the Brain:"
Then watch: The mystery of chronic pain:
http://ssigaaompt.blogspot.com/2012/11/pain-series-part-3_29.html or: http://w#mce_temp_url#ww.youtube.com/watch?v=RYoGXv22G3k
For an entertaining and more detailed explanation, watch this 15 minute video:
Finally, if you have 50 minutes, watch this video: