I'm not sure if this has been brought up before, but I'm sure most of us have heard that changes in weather and barometric pressure can worsen headaches and migraines. I found that bad headache days for me usually happen on days with big weather changes/ changes in barometric pressure. I have also heard April-May can be the worst time of year for this.

I found out the weather channel has an "Aches and Pains" rating based on the weather. It rates it on a scale of one to ten.

http://www.weather.com/activities/health/achesandpains/

I found its somewhat reassuring for me if I am having an usually bad day to confirm that drastic weather changes are involved.

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1st and only concussion March 20, 2011 playing hockey
Blind-sided hit, fell back, hitting back of my head on the ice
Headaches main symptom- fortunately no cognitive issues