Headaches vary greatly in terms of pain location, pain intensity, and how frequently they occur.
One theory says that migraine pain occurs because of waves of activity by groups of excitable brain cells, which trigger chemicals, such as serotonin to constrict blood vessels.
A migraine headache is unique among headaches because it includes symptoms other than pain. Nausea and vomiting, lightheadedness, and sensitivity to light are common with a migraine.
When seeking treatment for headaches, start with your primary care provider.