A migraine is a severe headache which occurs as a result of some physiological changes in the brain. A headache can be of any type; one can not term normal head pain as a migraine headache. Some specific symptoms occur which tells that you have a migraine headache. These migraine headache symptoms can vary from person to person. A migraine normally occurs on just one side of the brain. A migraine occurs in various stages; it is not necessary you experience all of them.