alarm clock headache

A rare form of cluster headache which has an abrupt onset and is of such severity that it wakes its victim, and classically occurs at the same time each day
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

alarm clock headache

Neurology A migraine of abrupt onset, which often occurs at the same time each day
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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