▁for ▁smart ph ones ▁are ▁becoming ▁increasing ly ▁common , ▁a ▁recent ▁review ▁found ▁most ▁are ▁developed ▁with ▁a ▁lack ▁of ▁evidence ▁base ▁and ▁scientific ▁expert ise . ▁ ▁New ▁head aches ▁ ▁New ▁head aches ▁are ▁more ▁likely ▁to ▁be ▁dangerous ▁secondary ▁head aches . ▁They ▁can , ▁however , ▁simply ▁be ▁the ▁first ▁presentation ▁of ▁a ▁chron ic ▁head ache ▁synd rome , ▁like ▁mig raine ▁or ▁t ension - type ▁head aches . ▁ ▁One ▁recommended ▁di agnostic ▁approach ▁is ▁as ▁follows . ▁If ▁any ▁ur gent ▁red ▁flags ▁are ▁present ▁such ▁as ▁visual ▁loss , ▁new ▁se iz ures , ▁new ▁weak ness , ▁new ▁confusion , ▁further ▁work up ▁with ▁imag ing ▁and ▁possibly ▁a ▁lum bar ▁pun ct ure ▁should ▁be ▁done ▁( see ▁red ▁flags ▁section ▁for ▁more ▁details ). ▁If ▁the ▁head ache ▁is ▁sudden ▁on set ▁( th under c lap ▁head ache ), ▁a ▁computed ▁tom ography ▁test ▁to ▁look ▁for ▁a ▁brain ▁ble ed ▁( sub ar ach no id ▁hem or rh age ) ▁should ▁be ▁done . ▁If ▁the ▁CT ▁scan ▁does ▁not ▁show ▁a ▁ble ed , ▁a ▁lum bar ▁pun ct ure ▁should ▁be ▁done ▁to ▁look ▁for ▁blood ▁in ▁the ▁C SF , ▁as ▁the ▁CT ▁scan ▁can ▁be ▁f als ely ▁negative ▁and ▁sub ar ach no id ▁hem or rh ages ▁can ▁be ▁fatal . ▁If ▁there ▁are ▁signs ▁of ▁in fection ▁such ▁as ▁fe ver , ▁r ash , ▁or ▁st iff ▁neck ,