Causes of Headaches
According to the International Classification of Headache Disorders (ICHD), there are four primary types of headaches: migraines, tension-type headaches, cluster headaches and other primary headaches. Secondary causes of headaches include head or neck trauma and injuries, stroke, intracranial hemorrhage, and vascular malformations.
The underlying cause of migraines is unknown. Research indicates that genetic factors play a role in who develops migraine headaches. Hormone levels are also a factor, and migraine headaches are three times more common among women than men. While the cause of migraines is unknown, there are a number of triggers, which are thought to instigate a migraine attack, though the strength and significance of the correlation are uncertain. Commonly reported triggers are stress, hunger and fatigue.