Why does every time i do something under the sun for a long time i get a headache the next day?!

Question: Why does every time i do something under the sun for a long time i get a headache the next day.?
Answers:

dehydration all the way! You need to drink, i think its.. around 8 glasses of water a day. If i dont do that and im active in the day, like even at work, i will get a headache. Water is key in this case i think.Health Question & Answer

Drink! Drink! Drink! LOTS OF WATER!!!Health Question & Answer

mild sun stroke maybeHealth Question & Answer

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Why does every time i do something under the sun for a long time i get a headache the next day?!

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