On the National Institute of Neurological Disorders and Stroke web site www.ninds.nih.gov/disorders/headache/detail_headache.htm I found a paragraph under other forms of migraine that says: Headache Free Migraine is characterized by such migraine symptoms as visual problems, nausea, vomiting, constipation, or diarrhea. Patients, however, do not experience head pain. Headache specialists have suggested that unexplained pain in a particular part of the body, fever, and dizziness could also be possible types of headache-free migraine.