Why eg paroxysmal clusters of unilateral headache over or about one eye which occur nightly often in the early hours of the morning headaches last 15minutes to 2 3 hours and the clusters last for 4 6 weeks may be associated with runny nose or eye on the same side of the headache flushing of the forehead and cheek or droopy eyelid. Not only is headache painful but it is also disabling in the global burden of disease study updated in 2013 migraine on its own was found to be the sixth highest cause worldwide of years lost due to disability yld headache disorders collectively were third highest headache disorders impose a recognizable burden on sufferers including sometimes substantial personal suffering impaired . Established worldwide as the one definitive encyclopedic reference on headache the headaches is now in its thoroughly revised updated third edition the foremost international authorities examine the mechanisms of over 100 types of headache and provide evidence based treatment recommendations including extensive tables of controlled clinical trials. Award winning news and culture features breaking news in depth reporting and criticism on politics business entertainment and technology. History of present illness includes questions about the headaches characteristics location duration severity onset eg sudden gradual quality eg throbbing constant intermittent pressure like exacerbating and remitting factors eg head position time of day sleep light sounds physical activity odors chewing are noted if the patient has had previous or recurrent headaches
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