There are more than 100 million people in chronic pain in the United States. The rate of providing healing is hardly successful. Microglia, the ever-vigilant guardian cells of the central nervous system (CNS), are now providing a clue as to why some of us stay sick and fail to recover.
http://www.realclearhealth.com/articles/2016/10/31/why_are_we_in_so_much_pain_110211.html
