5- A ccording to severity :- very severe and acute in severe & recurrent in cluster HA, moderately severe SAH, severe & temp in temp arteritis, very severe & dull in SOL. 6- According to associated symptoms :- fever and photophobia in meningitis, HA increased by cough & sneezing in SOL; visual symptoms in SOL, BIH, migr and TIA
- Increased ICP without SOL, ventricular dilatation or CSF obstruction or impairment of consciousness.
- Occur usually in obese females wz menstrual disturbances, usually during child bearing age - Tetracyclines, vit A, pills and steroid, may be other causes. - Headache and papilloedema wz threat to vision +/- false localizing signs, but no focal