Cluster headache , also called “ suicide headache ” is a neurological disease that involves, as its most prominent feature, an immense degree of pain in the head. Cluster headaches occur periodically: spontaneous remissions interrupt active periods of pain. The cause of the disease is currently unknown. It affects approximately 0.1% of the population, and men are more commonly affected than women.
Cluster headaches are excruciating unilateral headaches of extreme intensity. The duration of the common attack ranges from as short as 15 minutes to three hours or more. The onset of an attack is rapid, and most often without the preliminary signs that are characteristic of a migraine. However, some sufferers report preliminary sensations of pain in the general area of attack, often referred to as “shadows”, that may warn them an attack is lurking or imminent.
The pain may be very sharp and may cause pain around the eye area and may also be a pain within the back of the eye. The pain of cluster headaches is markedly greater than in other headache conditions, including severe migraines; experts have suggested that it may be the most painful condition known to medical science. Female patients have reported it as being more severe than childbirth. In some cases even morphine is not enough.