Cluster headaches appear abruptly with sudden and severe stabbing pain behind and around the eye, including one side of the head. They are called cluster headaches due to the repeated short-lived nature of the attacks. They tend to range from one to three attacks per day over a one to two month period. There is an increased incidence in middle-aged men. Sufferers often wake up from sound sleep and describe cluster headaches as stabbing and agonizing with a steady ache or deep burning sensation.
Cluster headaches can be confused with Cervicogenic headaches.