Hello,
Taking too much pain medication too frequently can cause something called "rebound headache." In this case, the cause of the headache is the pain medication. Here is some more information about it.
http://www.mayoclinic.com/health/rebound-headaches/DS00613
http://www.headaches.org/consumer/educationalmodules/completeguide/other.html
http://headaches.about.com/od/allheadpaintype1/a/med_overuse_ha.htm
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