TABLE 59.1 PATHOPHYSIOLOGIC CLASSIFICATION OF HEADACHES I Vascular A Febrile illness B Migraine C Systemic hypertension D Hypoxia E Caffeine withdrawal II Muscle contraction (tension) III Inflammation A Intracranial infections Meningitis Encephalitis Brain abscess B Pharyngitis C Upper respiratory infection D Dental infection E Sinus infection F Retroorbital cellulitis/abscess IV Traction/compression A Brain tumor B Intracranial hemorrhage C Increased intracranial pressure Cerebral edema Hydrocephalus Idiopathic intracranial hypertension D Brain abscess E Lumbar puncture F Arterial dissection V Posttraumatic VI Psychogenic