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

Psilocybin has shown promise in treating forms of OCD that are resistant to other therapies, in relieving cluster headaches (a common form of chronic headache) and in alleviating the anxiety experienced by terminally ill cancer patients.

ECONOMIST: LSD