Cluster headaches are considered to be one of the most painful types of headaches. They often awaken people in the middle of the night with intense pain in, behind, or around the eye on one side of the head.
Migraines can result in severe throbbing or pulsing pain, usually on one side of the head. This is often associated with other symptoms, such as nausea, vomiting and sensitivity to both light and sound.
The causes of migraines are not well understood; however, it appears that genetics and environmental factors can play an important role. Suggested causes include alterations in the brainstem and its interactions and imbalances in brain chemicals, particularly serotonin.
A number of factors can trigger migraines in different people. These include: certain foods (eg. salty or processed foods), stress, changes in sleeping patterns, bright lights, sun glare and certain medications.