Migraine and cluster headaches are vascular headaches.

偏头痛和丛集性头痛是血管型头痛。

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The Cleveland Clinic says the cause of cluster headaches is in a brain area known as a trigeminal-autonomic reflex pathway.

VOA: special.2010.03.30

When the nerve is made active, it starts pain linked to cluster headaches.

VOA: special.2010.03.30

Doctors say cluster headaches often strike during changes of season.

VOA: special.2010.03.30

One sufferer of cluster headaches said it was like having a red-hot poker shoved in his eye.

BBC: Headaches and painkillers

Far worse are migraines and cluster headaches which can be completely debilitating.

BBC: Headaches and painkillers