Why does my head hurt when I study?

Whenever I start studying I feel this weird pain in my head. I browsed some others similar questions and they said that it might have something to do with eyesight but I don't wear glasses and I can see perfectly. I can even spend the entire day on my iphone or computer feeling ok.

Please help me I can barely study for my finals and I'm afraid that I might fail.

I get like that too. Honestly it might be because you're stressed out. My eye doctor said I had good eye sight but he gave me reading glasses to use when I read/study because that's when I would get head pain and it really helped!

Just relax and drink plenty of water and make sure you are eating healthy foods.