I used to have this ‘headache’ frequently.Today I read a article from internet:Why You Have a Headache?
SCREEN SCREAM: We’ve been working on the PC for the last 2 hours. Starting at the screen non-stop makes our eyes protest - with a pounding headache. (Solution: Shut your eyes and relax. Or look out the window, watching the clouds..perhap..green grass will help)
CUT THAT GLARE: No sunglasses when driving or walking outdoors?Prepare for a massive headache after, espcially if you’re generally sun-sensitive.(Solution: Wear a pair of sunglasses that will protect from UVA and UVB rays. Or wear a cap with a rim that shades your eyes.)
HOLD THAT COFFEE: While caffeine is found in some painkillers,more than 4 cups of strong coffee can result in a caffeine overload and a headache for some. (Solution:Drink water,lots of it, to dilute the caffeine in your system.
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