Here's another example, say I was delivering a lesson and was standing in front of the media board (these are the boards that replaced the blackboards, although the word blackboard is no longer in use as it is not PC!!, but you catch my drift), anyway, if I am obstructing your view of the 'media board', what would you identify as the problem? Would you move the position of your own chair to get a better view, and would that stop me from obstructing your view again in the future? Or would you change the position of the board so everyone could view it regardless of where the tutor was standing? How would you go about solving this problem or any problem for that matter.
All problems have 'roots' and to get to the roots you have to do some digging! Metaphorically of course!
In the case of the headache you may ask yourself, why did I get the headache, maybe stress, what caused the stress, relationship issues, financial issues, time constraints, pressure at work etc. If you start digging you will eventually exhaust all the possibilities, then and only then, will you get to the root of your problem, let's say the stress was work related, you could ask yourself was it because of managers, colleagues, other agencies that you are dealing with as part of your own daily work or is it because your own workload is proving too difficult to manage. Let's say it you've narrowed it down to your workload being too stressful for you, you can now begin to find solutions to your identified problem.