Due to my son’s headaches I have been searching online for causes of headaches and migraines. Although most people think that headaches are an adult problem, I was informed by doctors that a lot of children suffer from them.
Headaches in children can have several origins:

Stress due to exams or other situation
Too much television and computer
Infection
Too much video games
Little rest
Etc.

There are also less common reasons like:

Brain Infection
Tumors
Meningitis
etc.

I also have headaches and migraines and spending all day (and night) looking at a computer screen doesn’t help at all. I really don’t know …