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I sometimes get headaches where if I try and ignore them and continue with my work, they get so bad I feel sick and have to have a lie down until it passes. I've found that the best thing to do is stop working the moment one starts to develop and get away from the PC.

But I wondered, why/how can concentrating/thinking make a headache worse? What's the link?

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    Are you sure the issue is thinking and not the effect of the PC screen on your eyes? If you switch to reading a book, or thinking hard away from the screen, what is the impact on the headache? – Kate Gregory Apr 19 '17 at 0:40

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