Cluster headaches are a type of
Cluster headaches are very painful. They usually cause very strong pain on one side of the head, behind the eye and temple. The headaches can last anywhere from 15–180 minutes. People with severe cases may have cluster headaches many times a day.
Cluster headaches may also cause other
They are called "cluster headaches" because they usually come and go. For a while, person may have many attacks of cluster headaches. Sometimes, they may then have no cluster headaches for a while. If a person has no cluster headaches for a while, this is called a remission period. No one knows why remission periods happen. Some people with cluster headaches never have a remission period.
Cluster headaches can be
In people who do not carry a