DEAR DOCTOR K: I get excruciatingly painful cluster headaches. What can I do to treat, or better yet, prevent them?
DEAR READER: Cluster headaches are rare. Only about one adult in a thousand suffers from them. But they are among the most painful of all headaches. We doctors have theories about what causes cluster headaches, but the fact is that we don't really know. They do run in families: There is an inherited, genetic component.