With so many people working in offices, one of the biggest culprits is 'computer hunch', the tension that builds up from too many long hours working on your PC (or Mac!). Sitting with our necks pulled forward, often with our shoulders up is not a natural position. Add in the mental stress that often accompanies our working day, deadlines, work overload etc, and you have a problem.
Tension Headaches
If you're tension is locked in, try Body Stress Release if you have a local practitioner, or try and find a similar complimentary health technique.