What is a Cluster Headache?

According to Medilexicon's medical dictionary:

    Cluster headache is "possibly due to a hypersensitivity to histamine; characterized by recurrent, severe, unilateral orbitotemporal headaches associated with ipsilateral photophobia, lacrimation, and nasal congestion."

Cluster headaches (also used in singular: headache), also nicknamed suicide headaches, occur several times a day, they come on unexpectedly, do not last long, and are generally very painful. The pain is usually intense, and sometimes only on one side of the head. Frequently, the sufferer also feels pain around the eye.

A cluster-headache sufferer can wake up during the night because of the pain. Often, this occurs at the same time each night. The eye on the painful side of the head may be reddened and watery. The individual's nose may be runny or blocked on the side of the nose where the pain is.

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