cluster headache

Etymology
So called because such headaches tend to occur together, i.e. in clusters.

Noun

 * 1)  An extremely painful, cyclical and unilateral headache.

Synonyms

 * Raeder's syndrome
 * suicide headache

Translations

 * Chinese:
 * Mandarin: 叢集性頭痛
 * Dutch: clusterhoofdpijn
 * Finnish: sarjoittainen päänsärky,
 * Norwegian:
 * Bokmål: