A cluster headache is a rare type of headache that is more common in men. Cluster headaches start suddenly. The pain is usually behind or around one eye and is very severe. The eye and nose on the same side as the pain may also become red, swollen and runny.
Cluster headaches cause severe pain and restlessness.
These headaches can be frightening to the sufferer and his or her family. A cluster headache can last a few minutes or several hours, but it usually lasts for 30 to 45 minutes. Cluster periods usually last 4 to 8 weeks and may occur every few months. At other times, no cluster headaches will occur. The cause of cluster headaches is not known.