Cluster headaches: Cluster headache is a

Cluster headache is a severe, unilateral headache disorder that affects about 0.1% of the population. It is characterized by recurrent attacks of pain around the eye, often accompanied by eye watering, nasal congestion, and autonomic symptoms. Cluster headaches are severely painful and occur in cycles. Read more for tips on how to treat and relieve them. Cluster headaches, relatively short but intensely painful headaches around the eye that occur every day for weeks or months at a time. Cluster headaches are sudden, excruciating headaches that usually affect one side of the head and the area around the eyes. Learn more here.