You are visiting  Barbara Feick Gregory's Cluster Headaches website
Cluster headaches are defined by the symptoms:

Symptoms of cluster headaches:

  • It strikes quickly, without warning
  • Excruciating pain located around the eyes
  • Pain radiates to other areas - face, head, neck, and/or shoulders
  • Pain is mostly on one side I am restless when it hits
  • My eyes tear; it's like I'm crying but the pain is so bad, maybe I am
  • One eye gets all red
  • My nose gets all stuffy or runs on the side of the pain
  • I get sweaty
  • My face gets pale
  • My eyes/face swell on the same side as the pain
  • My pupils get small
  • My eyelid droops
  • The pain is burning
  • The pain is sharp
  • The pain feels like a hot poker being stuck in my eye
  • The pain feels like my eye is being pushed out of its socket
  • I can't lay down during an attack.
  • I hold my head and rock
  • I feel nauseous
  • I get very sensitive to light and sound
  • I get them mainly in the spring and fall
  • A headache can last anywhere from 15 minutes to a couple of hours
  • The headaches mostly occur at night
  • I will get several of them in one day
  • I will get them daily for a while and then not for a while

http://www.mayoclinic.com/health/cluster-headache/DS00487/DSECTION=symptoms

The problem with defining something by symptoms... There could be several very different causes for this type of pain.