• Headaches: Cluster - Cluster Headaches
• Highlights
• Introduction
• Causes
• Prognosis
• Risk Factors
• Symptoms

Cluster Headaches

Cluster headaches are among the most painful, and least common, of all headaches. The pain can be so excruciating that they are sometimes referred to as "suicide headaches." Their signature is a pattern of periodic cycles ("clusters") of headache attacks, which may be either:

• Episodic. Attacks occur regularly for 1 week to 1 year, separated by long pain-free periods that last at least 1 month. Between 80 - 90% of patients have episodic cycles. A significant number of people who...