DIFFERENTIAL DIAGNOSIS OF GENERAL HEADACHE

Differential diagnosis of general headache are : 
-intracranial abscess
-intracranial tumour 
-migraine 
-meningitis
-temporal arteritis
-subarachnoid hemorrhage 
-tic douloureux
-glaucoma
-refractive error
-intracranial AV malformation 
-pneumonia
-chronic obstructive pulmonary disease
-congestive cardiac failure 
-pulmonary embolism 
-infective endocarditis
-oral contraceptive intake
-vasodilators / nitrates
-ethanol 
-drugs withdrawal - amphetamine, ergot, beta blockers, clonidine
-hypoglycemia
-as a result of lumbar puncture
-premenstrual headache
-pseudotumour cerebri
-anemia