What Causes Headache?

I feel some headec problem from 6 month ago one doctor is that time advice you have no any problem just like this is migrain he advice the medicine betacap+10 sun company medicine i use that medicine 3 month i am feet that time but again this problem rising now i am taking homoeo pathy medicine now feeling ok but i chekup one thing i got the spondilitist the report is c5 vertiber mild degrasive i feel that this is the also reason of headec please suggest now