This office was notified on 12/4 of this injury. EE states on 11/8/13 he was carrying AX rails, was bent over to get them through an area 42"" high and struck his head on roof bolt strap feeling pain in his low back/legs. EE sought med treatment on 12/2, was taken off work for 1 day on 12/3 and returned to modified duty 12/4/13. This is an aggravation of an existing injury.