What is a headache?
Question:
Answers:
a headache occurs from dilation of the veins in your head for some reason. the pressure from all the blood rushing to your cranium causes the pain.
Other Answers:
when someone hits you up side it ...
it is pain in the head from stress, the blood vessels constret and cause the pain in the head. light can and if you are reading to much in dim light.
There are alot of cause of headaches. Try this site that Yahoo has to see if you can find the source of yours.
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