Share of Cost, Cluster Headaches
Cluster headaches, which affect more men than women, are recurring headaches that occur in groups or cycles. They appear suddenly and are characterized by severe, debilitating pain on one side of the head, and are often accompanied by a watery eye and nasal congestion or a runny nose on the same side of the face.
During an attack, people often feel restless and unable to get comfortable; they are unlikely to lie down, as someone with a migraine might. The cause of cluster headaches is unknown, but there may be a genetic component. There is no cure, but medication can cut the frequency and duration.