A type of headache that predominantly affects middle-aged men. It includes episodes of severe, one-sided pain around the eye that occurs daily for several weeks and accompanied by other symptoms. It is also known as migrainous neuralgia.

The headache is always unilateral, excruciating, and most uniquely, in timed attacks called "clusters."

Cluster headaches are characterized by intense burning and boring pain, frequently located in or around one eye and temple and occasionally in one cheek or...