cluster headache
noun [ C ] medical specialized uk/ˈklʌs.tə ˌhed.eɪk/ us/ˈklʌs.tɚ ˌhed.eɪk/
集束性头痛（一种剧烈头痛，主要影响头部一侧，在一段时间内反复发作）
a very severe headache, affecting mainly one side of the head and happening several times within a period of time
Cluster headaches are a lifelong condition for most sufferers. 对大多数患者来说，集束性头痛是一种终生疾病。