Very different..I dunno how normal headache occurs, but migraine
is due to the blood vessels in the brain..somewhere at the cervex I
think..
For mine, the Classical Migraine, the blood vessel will shrink
first..causing my "aurora" and nausea..then after a while it
dilates(expands)..causing the headache..because the expanding blood
vessel is pressing on nerves in the brain..and if it's serious,
blood vessel will burst and cause a stroke..there have been cases
where migraine sufferers sometimes die of a stroke..
And for adults, pain is usually on one side..but for kids, it's
usually the whole head..hence it's very very hard for doctors to
determine whether a child is suffering from migraine or not..My
pain is the whole head those kind..but I'm exactly a kid already..I
also dunno why.. 
