Probable Migraine Headaches, formerly known as Migrainous Headaches, are simply headaches that fail to fulfill the criteria of Migraine without aura because they are missing one element. You must still have 5 headaches that last from 4 hours to 72 hours.

Occasionally an individual headache meets the criteria for both probable migraine and tension headache. By ICHD rules, the probable migraine should be thrown out. I personally feel this is a mistake and I suspect most patients who are in this situation actually do have migraine. I think the best way to be sure of the diagnosis is to answer a diagnostic headache questionaire during a headache.

Migraine Epidemiology or Frequency