familial hemiplegic migraine

n.
  1. A rare inherited migraine disorder characterized by a temporary paralysis of one side of the body followed by severely throbbing headaches and nausea; it occasionally can cause coma.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.