What causes headaches?

Yeah because I'm confused on how you get headaches lol.
does anything like trigger it?
and what exactly hurts inside of you head.
haha

The two most common types of headaches, migraines and tension come from two different sources The migraine is caused by dilation of the blood vessels in the head which can cause pounding headaches. The tension headache is one that is caused by muscle contractions in the head.

well im not sure how your head can actualli hurt because your brain feels no pain so I dont get that science part but I do know how people can get them,

1.MSG
"its in allot crap food it basically slowly kills you"
2.Bright lights
3.Stress
4.Something biologically rong with you.
5. If you skip meals
6.Falling on your head.

theres allot ways

LOAD NOISES..

someones dumb

for some chocolate,tomatoes, oranges,red wine these are what I remember can trigger a headache in some people.sucks.